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1. Mid-infrared supercontinuum generation from 2 to 14 μm in arsenic- and antimony-free chalcogenide glass fibers

Author

Jean-Charles Jules, Paul Froidevaux, Frédéric Désévédavy, Arnaud Lemière, Olivier Faucher, Christophe Aquilina, Pierre Béjot, Frédéric Smektala, Bertrand Kibler, Grégory Gadret, Franck Billard, Pierre Mathey, Laboratoire Interdisciplinaire Carnot de Bourgogne [Dijon] (LICB), Université de Bourgogne (UB)-Université de Technologie de Belfort-Montbeliard (UTBM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), SLCO, Laboratoire Interdisciplinaire Carnot de Bourgogne (LICB), and Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)-Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Optical fiber, business.industry, Chalcogenide, Glass fiber, Physics::Optics, Chalcogenide glass, Statistical and Nonlinear Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, Supercontinuum, law.invention, 010309 optics, Core (optical fiber), chemistry.chemical_compound, chemistry, law, 0103 physical sciences, Femtosecond, Optoelectronics, [NLIN]Nonlinear Sciences [physics], Photonics, business
Abstract

International audience; We demonstrate the fabrication of arsenic-and antimony-free chalcogenide glasses compatible with glass fiber processing. Optical fibers with distinct index profiles are presented and characterized, namely, single-material fibers with or without a suspended core and standard step-index fibers with varying core diameter. In addition, we evidence their potential for nonlinear photonic devices in the mid-infrared spectral region by means of super-continuum generation experiments in the femtosecond regime. Spectral broadenings extend on several octaves in the mid-infrared from 2 to 14 μm.

Published
2019

2. Experimental determination of optical constants of MgF2 and AlF3 thin films in the vacuum ultra-violet wavelength region (60–124nm), and its application to optical designs

Author

Alexander Gottwald, Françoise Bridou, Mathias Richter, Mireille Cuniot-Ponsard, Jean-Michel Desvignes, Udo Kroth, Laboratoire Charles Fabry de l'Institut d'Optique / Scop, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Physikalish-Technishe Bundesanstalt (PTB), and bundesministerium für Wirtschaft und Technologie

Subjects
3D optical data storage, Materials science, Ultra violet, Synchrotron radiation, 02 engineering and technology, engineering.material, 01 natural sciences, 010309 optics, Optics, Coating, 0103 physical sciences, Transmittance, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Thin film, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Range (particle radiation), business.industry, 021001 nanoscience & nanotechnology, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Wavelength, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], engineering, 0210 nano-technology, business
Abstract

International audience; The investigation of some solar radiations of interest for astrophysicists requires optics in the 80–130 nm vacuum ultra-violet spectral range (VUV). In this domain, where both transmittance and reflectance of most materials are very low, the measurement of optical constants is specifically difficult, and optical data are consequently often either inexistent or uncertain. Reliable modelling of optical components for VUV, like polarizing multi-layered mirrors, necessitates prior measurement of complex indices of the thin films involved in the coating. Fluorides like MgF2 or AlF3 are among the rare materials capable to contribute to multi-layer mirrors in the VUV. We have determined optical constants of thin films of these two materials by using a two media reflectance method at normal incidence and a graphical determination particularly suited to this VUV region, which we presented in a previous paper. Optical constants are determined in the range 60–124 nm with 2 nm step, and are compared to existing data. On the basis of these measured indices, polarizing mirrors for k1 = 121.6 nm or k2 = 103.2 nm have been modelled and fabricated. Their reflectance measured versus incidence angle by using monochromatized synchrotron radiation at the above wavelengths is found in agreement with the calculated predictions.

Published
2010

3. Holographic frequency modulated continuous wave laser radar

Author

P. Delaye, G. Roosen, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), and Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010302 applied physics, Physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Astrophysics::Instrumentation and Methods for Astrophysics, Holography, Phase (waves), Physics::Optics, Nonlinear optics, Condensed Matter Physics, Holographic interferometry, 01 natural sciences, Electronic, Optical and Magnetic Materials, law.invention, 010309 optics, Optics, law, 0103 physical sciences, Demodulation, Continuous wave, Radar, business, Phase conjugation, Instrumentation
Abstract

International audience; We present the operating principle and a first experimental characterization of a holographic rangefinder, that couples a two wave mixing phase demodulation set-up with a frequency modulated laser source. In its first implementation, the system allows millimetre sensitivity on tens of meters measurement range with the ability to work with scattering surfaces

Published
2007

4. Stimulated Raman scattering in hollow core photonic crystal fibres

Author

Philippe Delaye, Sylvie Lebrun, Gérald Roosen, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), and Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, Hollow core, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Physics::Optics, General Physics and Astronomy, 02 engineering and technology, 01 natural sciences, Photonic crystal fibre, 010309 optics, symbols.namesake, Nonlinear system, Transmission properties, 020210 optoelectronics & photonics, Optics, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, symbols, business, Raman spectroscopy, Raman scattering
Abstract

International audience; We present an experimental demonstration of stimulated Raman scattering in a hollow core photonic crystal fibre filled with ethanol. By combining the original transmission properties of these fibres with a highly nonlinear liquid we have realized a very efficient Raman generator. This technique can be applied to other nonlinear mechanisms and opens the way towards the realisation of new fibered components for optical systems

Published
2007

5. High power multimode fiber amplifier with wavefront reshaping for high beam quality recovery

Author

Gaëlle Lucas-Leclin, Gilles Pauliat, Patrick Georges, Eric Lallier, Arnaud Brignon, G. Roosen, Jean-Pierre Huignard, Laurent Lombard, Thales Research and Technology [Palaiseau], THALES, Laboratoire Charles Fabry de l'Institut d'Optique / Elsa, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), and Laboratoire Charles Fabry de l'Institut d'Optique / Manolia

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Multi-mode optical fiber, Materials science, business.industry, Amplifier, Energy conversion efficiency, General Engineering, Physics::Optics, Energy Engineering and Power Technology, 02 engineering and technology, Photorefractive effect, 01 natural sciences, 010309 optics, 020210 optoelectronics & photonics, Optics, Fiber laser, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Physics::Accelerator Physics, M squared, Laser beam quality, business, ComputingMilieux_MISCELLANEOUS, Beam (structure)
Abstract

The increase in fiber laser and amplifier output power is limited by nonlinear effects and material damage due to the high power density, especially in pulsed operation. Output powers of several hundreds watts have recently been achieved with large-mode-area quasi-singlemode fibers. To further increase the core diameter, an original alternative approach consists in correcting the beam profile after a multimode fiber amplifier by a nonlinear beam cleanup method. We report the conversion of a multimode and depolarized output beam of a highly multimode diode-pumped Yb-doped fiber amplifier to a diffraction limited, linearly polarized beam by two original beam cleanup methods: • the first converts the multimode beam to a singlemode beam using self-referencing two wave mixing process in an infrared sensitive photorefractive crystal (Rh:BaTiO3). With this setup, up to 11.6 W singlemode output is achieved with a 78% multimode to singlemode photorefractive conversion efficiency, • the second converts a multimode beam into a singlemode beam by use of the Brillouin effect in a multimode gradient-index (GI) fiber with a self-aligned loop geometry. A preliminary conversion from a M 2 = 6.5 beam into a M 2 = 1.3 beam with 31% efficiency is reported. To cite this article: L. Lombard et al., C. R. Physique 7 (2006).

Published
2006

6. Simultaneous determination of the index and absorption gratings in multiple quantum well photorefractive devices designed for laser ultrasonic sensor

Author

Tsutomu Shimura, Y. Arakawa, F. Grappin, Satoshi Iwamoto, Kazuo Kuroda, Philippe Delaye, Gérald Roosen, Institute of Industrial Science (IIS), The University of Tokyo (UTokyo), Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), and The University of Tokyo

Subjects
010302 applied physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, Field (physics), business.industry, Physics::Optics, Photorefractive effect, Laser, 01 natural sciences, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, law.invention, 010309 optics, Wavelength, Amplitude, Optics, law, 0103 physical sciences, Ultrasonic sensor, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Absorption (electromagnetic radiation), business, Phase modulation
Abstract

International audience; A new method to determine complex amplitudes of index and absorption gratings in photorefractive multiple quantum wells is presented. In usual method to evaluate these parameters, spectral measurement of absorption change due to the applied field over a wide wavelength range is required and the index change is calculated through the Kramers-Krönig's relationship. In our method, only a set of measured data for photorefractive two-wave mixing set-up with small sinusoidal phase modulation for fixed wavelength is needed. This is thus well adapted to insitu characterization of systems that operate at a given wavelength. Real and imaginary part of the gains owing to the index and the absorption gratings are calculated from the output signals of the system. We apply this method to our photorefractive multiple quantum devices operating at 1064 nm, and obtain consistent results

Published
2004

7. Photorefractive two-beam coupling characterization of a barium-calcium titanate crystal

Author

Ph. Delaye, H. Veenhuis, D. Rytz, Sylvie Bernhardt, Gérald Roosen, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), Fachbereich Physik [Osnabrück], Universitat Osnabruck, Forschunginstitute für Mineralische und Metallische Werkstoffe, and Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Phase transition, Materials science, Physics and Astronomy (miscellaneous), Beam coupling, Phase (waves), chemistry.chemical_element, Physics::Optics, General Physics and Astronomy, 02 engineering and technology, Molecular physics, 01 natural sciences, 010309 optics, Condensed Matter::Materials Science, Tetragonal crystal system, chemistry.chemical_compound, Optics, 0103 physical sciences, 010302 applied physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Electrostriction, Condensed matter physics, business.industry, General Engineering, Barium, Photorefractive effect, Polarization (waves), 021001 nanoscience & nanotechnology, Ferroelectricity, Piezoelectricity, Calcium titanate, chemistry, business, 0210 nano-technology, Refractive index
Abstract

International audience; We present two beam coupling characterization of Ba0.77Ca0.23TiO3, a ferroelectric material with no phase transition around room temperature that shows high photorefractive gain (7cm-1 with ordinary polarization and 15cm-1 with extraordinary polarization). We measure the electrooptic coefficients of Ba0.77Ca0.23TiO3. These values are compared to estimated theoretical values, calculated using a model that allows to deduce the tetragonal phase parameter (Pockels and piezoelectrics coefficients) from the parameters of the high temperature cubic phase (Kerr and electrostriction coefficients)

Published
2000

8. Photorefractive vibrometer for the detection of high-amplitude vibrations on rough surfaces

Author

Ph. Delaye, S. de Rossi, G. Roosen, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), and Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, High amplitude, business.industry, Physics::Optics, 02 engineering and technology, Photorefractive effect, Laser, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, 010309 optics, Vibration, 020210 optoelectronics & photonics, Optics, Semiconductor, law, 0103 physical sciences, Photorefractive crystal, 0202 electrical engineering, electronic engineering, information engineering, business, Nonlinear Sciences::Pattern Formation and Solitons, Laser Doppler vibrometer, Mixing (physics)
Abstract

International audience; We present and characterize theoretically and experimentally a photorefractive velocimeter. This device, based on two-wave mixing in a rapid photorefractive crystal, measures the instantaneous velocity of a vibrating target. It is particularly adapted to the measurement of high-amplitude (up to several mm) low-frequency (up to several kHz) vibrations. Instantaneous velocities as high as 25 mm s-1 are expected to be measured with common photorefractive semiconductors and CW lasers

Published
2000

9. Experimental investigation of a photorefractive ring phase modulation amplifier

Author

Philippe Delaye, Laurent Frey, A. Mugnier, Gérald Roosen, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), and Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)

Subjects
010302 applied physics, Laser ultrasonics, Physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Amplifier, Quantum noise, 02 engineering and technology, Photorefractive effect, 021001 nanoscience & nanotechnology, 01 natural sciences, Signal, Low-noise amplifier, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Signal-to-noise ratio, Optics, 0103 physical sciences, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, 0210 nano-technology, business, Phase modulation
Abstract

International audience; We present the experimental investigation of a photorefractive ring phase modulation amplifier, that is not resonant and that can work with distorted beams. We show that with this geometry an amplification by a factor 5 of a phase modulation signal is possible. We also show that this strong amplification is alleviated by the presence of losses in the ring. These losses lead to a real gain in signal to noise ratio of a factor 3, that nevertheless expresses that with such a system the photon noise limit of laser ultrasonics system can be overpassed. The losses are also responsible for the strong sensitivity of the system to the vibrations, which puts a strong limitation of the ring amplifier

Published
1997

10. Transmission of time modulated optical signals through an absorbing photorefractive crystal

Author

L. A. de Montmorillon, Ph. Delaye, Gérald Roosen, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), and Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Coupling, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, business.industry, Physics::Optics, Photorefractive effect, 01 natural sciences, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, law.invention, 010309 optics, Optics, Transmission (telecommunications), Signal beam, law, 0103 physical sciences, Photorefractive crystal, Physics::Accelerator Physics, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, 010306 general physics, Absorption (electromagnetic radiation), business, Beam splitter, Beam (structure)
Abstract

International audience; We solve the problem of the transmission of time modulated signals in a two beam coupling photorefractive set-up using an absorbing material. We obtain an analytical expression that describes this phenomenon in absence of pump beam depletion due to beam coupling. We use this expression to analyse the influence of absorption on the photorefractive build-up. We also describe, using this model, the photorefractive beamsplitter response. It is also showed that the π/2 phase shift between illumination and index gratings is detrimental to a linear detection of the phase variation of the signal beam

Published
1995

11. Comparative study of CdTe and GaAs photorefractive performances from 1 μm to 1.55 μm

Author

L. A. de Montmorillon, Ph. Delaye, Gérald Roosen, J.C. Launay, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), Pôle de Recherche Aquitain pour les Matériaux dans l'Espace (PRAME), and Université de Bordeaux (UB)

Subjects
Absorption spectroscopy, Vanadium, chemistry.chemical_element, 02 engineering and technology, 01 natural sciences, Inorganic Chemistry, Optics, 0103 physical sciences, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Spectroscopy, 010302 applied physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Wavelength range, Chemistry, Organic Chemistry, Doping, Photorefractive effect, 021001 nanoscience & nanotechnology, Atomic and Molecular Physics, and Optics, Cadmium telluride photovoltaics, Electronic, Optical and Magnetic Materials, Wavelength, Optoelectronics, 0210 nano-technology, business, Near infrared radiation
Abstract

International audience; We present a photorefractive investigation of the vanadium doped CdTe at different wavelengths from 1.06 μm to 1.55 μm. The sensitivity and performances of different samples grown with different conditions are deduced. We compare these performances with the ones of the undoped GaAs in the same wavelength range

Published
1995

12. Photorefractive effect in (001)-cut GaAs at short pulse excitation

Author

Kestutis Jarasiunas, Philippe Delaye, Gérald Roosen, L. Bastiene, Material Science and Applied Research Institut (Vilnius), Vilnius University [Vilnius], Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), and Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Materials science, 02 engineering and technology, 01 natural sciences, Molecular physics, Signal, Inorganic Chemistry, Optics, 0103 physical sciences, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Spectroscopy, 010302 applied physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Organic Chemistry, Photorefractive effect, 021001 nanoscience & nanotechnology, Space charge, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Pulse (physics), Picosecond, Charge carrier, Dislocation, 0210 nano-technology, business, Excitation
Abstract

International audience; We present experimental studies of photorefractive effect in non-photorefractive orientations of LEC-grown GaAs crystals. Picosecond DFWM experiments, carried out in different samples, show that forbidden photorefractive signal correlates well with dislocation density and confirms hypothesis that the effect arises from strain fields around growth-defects

Published
1995

13. Temperature enhancement of the photorefractive effect in GaAs due to the metastable state of theEL2 defect

Author

Ph. Delaye, B. Sugg, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), Fachbereich Physik [Osnabrück], and Universitat Osnabruck

Subjects
010302 applied physics, Coupling, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, Field (physics), Condensed matter physics, business.industry, Physics::Optics, 02 engineering and technology, Photorefractive effect, Grating, 021001 nanoscience & nanotechnology, 01 natural sciences, Diffusion field, Metastability, 0103 physical sciences, Optoelectronics, 0210 nano-technology, Absorption (electromagnetic radiation), business, Phase conjugation
Abstract

International audience; We present a theoretical and experimental analysis of photorefractive two-beam coupling in undoped GaAs as a function of temperature. The theoretical treatment includes the metastable state of the EL2 defect with its optical properties (optical generation and optical recovery) in the photorefractive model. Three major features are predicted by this model: First, a change of the sign of the photorefractive beam coupling gain around 150 K; second, an enhancement of the space-charge field by a factor of 2 compared to the diffusion field; and, finally, the appearance of a strong peak due to an absorption grating around 150 K. All these features are actually observed experimentally with a good correlation between experimental data and theoretical simulation.

Published
1994

14. Photorefractive measurements on electron-irradiated semi-insulating GaAs

Author

H. J. von Bardeleben, Philippe Delaye, Gérald Roosen, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), Groupe de Physique des Solides (GPS), and Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics and Astronomy (miscellaneous), Absorption spectroscopy, Infrared spectroscopy, 02 engineering and technology, Electron, 01 natural sciences, law.invention, symbols.namesake, Optics, law, 0103 physical sciences, General Materials Science, Irradiation, Absorption (electromagnetic radiation), Electron paramagnetic resonance, 010302 applied physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Chemistry, Fermi level, General Engineering, General Chemistry, Photorefractive effect, 021001 nanoscience & nanotechnology, symbols, Optoelectronics, 0210 nano-technology, business
Abstract

International audience; We present photorefractive measurements at 1.06 mgrm and 1.3 mgrm performed in electron-irradiated GaAs. Irradiation with electrons of kinetic energies ge1 MeV introduces intrinsic electrically active defects which modify the Fermi-level position and allow to modify the electron-hole competition mechanism of the photorefractive effect. Furthermore, it is shown that the optical absorption in the 1.3-1.5 mgrm spectral range can be increased, which might allow to enlarge the useful spectral range of GaAs towards optical telecommunication windows. The native and irradiation-induced defects are assessed by electron paramagnetic resonance and optical absorption spectroscopy conducted at T=300 K and 77 K. The direct influence of an irradiation-induced mid-gap defect on the photorefractive effect is experimentally and theoretically demonstrated

Published
1994

15. Photorefractive response of CdTe: V under ac electric field from 1 to 1.5 μm

Author

Jean-Claude Launay, Philippe Delaye, Gérald Roosen, Yves Belaud, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), Pôle de Recherche Aquitain pour les Matériaux dans l'Espace (PRAME), and Université de Bordeaux (UB)

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, business.industry, Ac field, 02 engineering and technology, Photorefractive effect, 021001 nanoscience & nanotechnology, Thermal conduction, 01 natural sciences, Atomic and Molecular Physics, and Optics, Cadmium telluride photovoltaics, Electronic, Optical and Magnetic Materials, 010309 optics, Wavelength, Optics, Electric field, 0103 physical sciences, Optoelectronics, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, 0210 nano-technology, business
Abstract

International audience; The AC field technique leading to the enhancement of the photorefractive effect is applied to Vanadium-doped Cadmium Telluride. Net photorefractive gain is obtained for the three wavelengths studied : 1.06μm, 1.32μm and 1.55μm. We observed a change in the sign of the photorefractive gain between 1.06μm and 1.55μm, which represents the first evidence of an electron-hole competition in this material. Theoretical interpretation is performed using an extension of the AC field theoretical model with bipolar conduction

Published
1994

16. Strontium Barium Niobate Thin Films for Dielectric and Electro-Optic Applications

Author

Mireille Cuniot-Ponsard, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), and Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010302 applied physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, business.industry, Lithium niobate, 02 engineering and technology, Dielectric, Strontium barium niobate, 021001 nanoscience & nanotechnology, 01 natural sciences, 7. Clean energy, Ferroelectricity, Pockels effect, Pulsed laser deposition, chemistry.chemical_compound, chemistry, 0103 physical sciences, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Optoelectronics, Thin film, 0210 nano-technology, business, Photonic crystal
Abstract

The existence of strontium barium niobate crystals (SrxBa1-xNb2O6, noted SBN:100x) was first reported in 1960 (Francombe, 1960) and first large SBN single crystals were grown by Ballman and Brown over the range 0.25

Published
2011

17. Photon extrabunching in ultrabright twin beams measured by two-photon counting in a semiconductor

Author

Philippe Delaye, Claude Fabre, Fabien Boitier, Emmanuel Rosencher, Nicolas Dubreuil, Antoine Godard, ONERA - The French Aerospace Lab [Châtillon], ONERA-Université Paris Saclay (COmUE), ONERA - The French Aerospace Lab [Palaiseau], Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Kastler Brossel (LKB (Jussieu)), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), Université Pierre et Marie Curie - Paris 6 (UPMC)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Multidisciplinary, Photon, business.industry, Bandwidth (signal processing), Physics::Optics, General Physics and Astronomy, General Chemistry, 01 natural sciences, Article, General Biochemistry, Genetics and Molecular Biology, Coincidence, 010309 optics, Optics, Semiconductor, Two-photon excitation microscopy, 0103 physical sciences, Light beam, Photonics, 010306 general physics, business, Parametric statistics
Abstract

For many years twin beams originating from parametric down-converted light beams have aroused great interest and attention in the photonics community. One particular aspect of the twin beams is their peculiar intensity correlation functions, which are related to the coincidence rate of photon pairs. Here we take advantage of the huge bandwidth offered by two-photon absorption in a semiconductor to quantitatively determine correlation functions of twin beams generated by spontaneous parametric down-conversion. Compared with classical incoherent sources, photon extrabunching is unambiguously and precisely measured, originating from exact coincidence between down-converted pairs of photons, travelling in unison. These results strongly establish that two-photon counting in semiconductors is a powerful tool for the absolute measurement of light beam photon correlations at ultrashort timescales., The second order correlation function g(2) is used to test quantum correlation properties of light. Here, two-photon counting is used to measure g(2) and an extrabunching effect is demonstrated, providing evidence that two-photon counting is an appropriate method for measuring light beam photon correlations.

Published
2011

18. Nonlinear interactions of optical pulses in a slow mode nanowires

Author

Robert Frey, Felix Kroeger, Philippe Delaye, Alexandre Baron, Stephane Trebaol, Nicolas Dubreuil, Govind P. Agrawal, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), and Institute of Optics

Subjects
Physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Raman amplification, Kerr effect, business.industry, Nanophotonics, Physics::Optics, Nonlinear optics, 02 engineering and technology, 01 natural sciences, Refraction, 010309 optics, 020210 optoelectronics & photonics, Optics, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Optoelectronics, Group velocity, business, Self-phase modulation, Local field, ComputingMilieux_MISCELLANEOUS
Abstract

Slow-mode micro-structured waveguides enable a large enhancement of optical nonlinearities. Using a generalization of the local field factor theory of nonlinear homogeneous media, we review the impact of the group velocity reduction on the hierarchy of the semi-conductor nonlinearities. As an illustration, we experimentally and theoretically reported an intrinsic limitation concerning the Raman amplification of short pulses in silicon nanowires through the self-phase modulation induced by both the optical Kerr effect and free-carrier refraction. Hence, we provide a fundamental insight on the nonlinear interaction of short pulses for the design of future slow-mode devices.

Published
2011

19. Polarizing and non-polarizing mirrors for the hydrogen Lyman-α radiation at 121.6 nm

Author

Mireille Cuniot-Ponsard, Mathias Richter, Jean-Michel Desvignes, Udo Kroth, Alexander Gottwald, Françoise Bridou, Laboratoire Charles Fabry de l'Institut d'Optique / Scop, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Physikalish-Technishe Bundesanstalt (PTB), bundesministerium für Wirtschaft und Technologie, and Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Hanle effect, Materials science, 02 engineering and technology, Radiation, engineering.material, 7. Clean energy, 01 natural sciences, 010309 optics, Resonator, chemistry.chemical_compound, Optics, Coating, 0103 physical sciences, General Materials Science, Thin film, Magnesium fluoride, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, General Chemistry, 021001 nanoscience & nanotechnology, Polarization (waves), Wavelength, chemistry, engineering, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology, business
Abstract

Efficient polarizing as well as non-polarizing mirrors for a wavelength of λ=121.6 nm (hydrogen Lyman-α radiation) are necessary to achieve an experimental determination of the magnetic field in the solar corona through the Hanle effect. We have designed, realized and characterized such mirrors. These consist of glass coated with a thin-film stack. The coatings use the most reflective (Al) and most transparent (fluorides) materials at this wavelength. Different coatings were explored which involve an increasing number of films in the coating stack. At the incident angle of maximum polarization where the p-polarized reflectivity R p is minimized, an s-polarized reflectivity R s as high as 69% is experimentally obtained with a coating made of a Fabry–Perot resonator. To our knowledge, this value is the highest ever reported for a polarizing mirror at this wavelength. Additionally, efficient non-polarizing mirrors have been designed and realized by using a two-layer coating (MgF2/Al/glass). By optimizing the fluoride layer thickness, a mirror with non-polarizing properties in the whole range of incident angles was realized.

Published
2011

20. Intrinsic limitations to the quality of pulsed spontaneous parametric downconversion sources for quantum information applications

Author

Jean-Loup Smirr, Romain Alléaume, Eleni Diamanti, Robert Frey, Isabelle Zaquine, Laboratoire Traitement et Communication de l'Information (LTCI), Télécom ParisTech-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), Information Quantique et Applications (IQA), Institut Mines-Télécom [Paris] (IMT)-Télécom Paris-Institut Mines-Télécom [Paris] (IMT)-Télécom Paris, Département Traitement du Signal et des Images (TSI), and Télécom ParisTech-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Quantum network, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Photon, business.industry, Bandwidth (signal processing), Statistical and Nonlinear Physics, Quantum channel, Quantum key distribution, 01 natural sciences, Atomic and Molecular Physics, and Optics, 010309 optics, Optics, 0103 physical sciences, Quantum information, 010306 general physics, business, Quantum information science, ComputingMilieux_MISCELLANEOUS, Coherence (physics)
Abstract

Spontaneous parametric downconversion (SPDC) sources are an essential element of quantum communication and quantum information processing systems. Their quality can be hampered by spectral, temporal, or spatial distinguishability of the two photons of a generated pair. Even when such defects have been corrected, the ultimate quality of the SPDC source is limited by the intrinsic multiple pair generation. In this paper, the effect of transmission, filtering and detection losses and asymmetrical spectral bandwidths in the photon pair paths on the visibility of the two-photon interference delivered by the SPDC source and its useful pair rate are investigated. In this investigation, two subcases are distinguished: deterministic and statistical splittings of the generated pairs, whatever the coherence of the multiple pairs. We show that the visibility is strongly degraded by a spectral bandwidth asymmetry, while the losses mainly affect the measured coincidence probability. The deterministic splitting configuration is shown to be generally more advantageous, although statistical splitting may present some advantages in applications with a narrow bandwidth requirement, such as those involving quantum memories. Moreover, while pump-induced optical noise only produces small visibility reductions, dark counts of the single-photon detectors are shown to limit the maximum possible visibility, particularly in the case of high-loss photon pair sources. Because our model quantifies the intrinsic limitations due to double pair emission in a simple way, the results presented can be used to optimize the design of SPDC sources and choose the optimum trade-offs between several key parameters such as visibility, generation probabilities, and spectral bandwidth, in particular for small bandwidth SPDC sources in the perspective of quantum networking and computing applications.

Published
2011

21. Picosecond investigation of photorefractive and free carrier gratings in GaAs: EL2 and CdTe: V

Author

Kestutis Jarasiunas, Gérald Roosen, Philippe Delaye, Jean-Claude Launay, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), Pôle de Recherche Aquitain pour les Matériaux dans l'Espace (PRAME), and Université de Bordeaux (UB)

Subjects
010302 applied physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Chemistry, Ambipolar diffusion, Doping, General Engineering, General Physics and Astronomy, Photorefractive effect, Grating, 01 natural sciences, Fluence, Cadmium telluride photovoltaics, 010309 optics, Optics, [PHYS.HIST]Physics [physics]/Physics archives, Picosecond, 0103 physical sciences, Optoelectronics, business, Absorption (electromagnetic radiation)
Abstract

Laser induced picosecond transient gratings are used to study carrier transport via free carrier and photorefractive nonlinearities in serni-insulating undoped GaAs and vanadium doped CdTe crystals. Absorption and carrier generation mechanisms are investigated through the variation of grating strengths with input fluence. We show that grating decays are governed by mostly ambipolar diffusion and by its variation with fluence. Ambipolar mobilities are measured: μa≈135 cm2.V-1.s-1 in CdTe and μa≈760 cm2.V-1.s-1 in GaAs.

Published
1993

22. Optical, photoelectrical, deep level and photorefractive characterization of CdTe:V

Author

J. P. Zielinger, Z. Guellil, Gérald Roosen, Philippe Delaye, Mayer Tapiero, Jean-Claude Launay, V. Mazoyer, Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Chimie du Solide, and Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010302 applied physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, Deep level, business.industry, Mechanical Engineering, Photoconductivity, 02 engineering and technology, Photorefractive effect, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Cadmium telluride photovoltaics, Spectral line, Characterization (materials science), Optics, Mechanics of Materials, Impurity, 0103 physical sciences, General Materials Science, 0210 nano-technology, Absorption (electromagnetic radiation), business, ComputingMilieux_MISCELLANEOUS
Abstract

Characterization of different optical techniques, such as photo-induced current transient spectroscopy (PICTS), absorption, photoconductivity spectra and photorefractive wave mixing, of semi-insulating V-doped Cdytals prepared by the modified Bridgman method are presented. The aim of this joint research programme is to provide information which can lead to the understanding of the complex processes which determine photorefractive effects and to optimize the key parameters.

Published
1993

23. Polarizing and non-polarizing mirrors in far UV for the Hydrogen Lyman-α radiation (λ = 121.6 nm)

Author

F. Bridou, M. Cuniot-Ponsard, J.-M. Desvignes, Laboratoire Charles Fabry de l'Institut d'Optique / Scop, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, and A. Calisti, C. Mossé et S. Ferri

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Hydrogen, Chemistry, business.industry, chemistry.chemical_element, Radiation, engineering.material, 7. Clean energy, 01 natural sciences, Synchrotron, law.invention, 010309 optics, Resonator, Wavelength, Coating, law, 0103 physical sciences, engineering, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Optoelectronics, Thin film, business, Coronagraph
Abstract

International audience; . We demonstrate the feasibility of efficient polarizing and non-polarizing mirrors at λ = 121..6 nm designed within the framework of the Lyman α Lyot Coronograph Imager project. We have designed, realized and characterized such mirrors Optical constants of the materials involved in the thin film coatings are determined experimentally. Reflectivity measurements in the VUV wavelength domain have been performed at PTB (Synchrotron at BESSY II, Berlin). A s-polarized reflectivity Rs as high as 68% is experimentally obtained with a coating made of a Fabry-Pérot resonator. To our knowledge this value is the highest ever reported for a polarizing mirror at this wavelength.

Published
2010

24. Second order coherence of broadband down-converted light on ultrashort time scale determined by two photon absorption in semiconductor

Author

Philippe Delaye, Antoine Godard, Aleksandr Ryasnyanskiy, Nicolas Dubreuil, Claude Fabre, Fabien Boitier, Emmanuel Rosencher, ONERA - The French Aerospace Lab [Châtillon], ONERA-Université Paris Saclay (COmUE), ONERA - The French Aerospace Lab [Palaiseau], Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), Laboratoire Kastler Brossel (LKB (Jussieu)), Université Pierre et Marie Curie - Paris 6 (UPMC)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Coherence time, Photon, Light, Degree of coherence, 01 natural sciences, Two-photon absorption, 010305 fluids & plasmas, Photometry, Optics, Multiphoton processes, 0103 physical sciences, 010306 general physics, Physics, Quantum optics, Photons, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Photon antibunching, business.industry, Equipment Design, Atomic and Molecular Physics, and Optics, Equipment Failure Analysis, Interferometry, Spectrometry, Fluorescence, Semiconductors, business, Coherence (physics), Photon statistics
Abstract

International audience; We study the photon correlation properties of broadband parametric down-converted light. The measurement of the photon correlation is carried out thanks to a modified Hanbury Brown-Twiss interferometer based on two photon absorption in GaAs detector. Since this method is not affected by the phase matching conditions of the detecting apparatus (so called “final state post-selection”), the detection bandwidth can be extremely large. This is illustrated by studying, with the same apparatus, the degree of second order coherence of parametric light in both degenerate and non-degenerate cases. We show that our experiment is able to determine the coherent as well as the incoherent contributions to the degree of second order coherence of parametric light with a time resolution in the fs range scale.

Published
2010

25. Saturation of the Raman amplification by self-phase modulation in silicon nanowaveguides

Author

Robert Frey, Philippe Delaye, Nicolas Dubreuil, Gérald Roosen, David Peyrade, Alexandre Baron, Aleksandr Ryasnyanskiy, Felix Kroeger, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), Laboratoire des technologies de la microélectronique (LTM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), ANR, ANR MIRAMAN, ANR-08-BLAN-0138,ELVIS,Micromechanical approach of nonlinear ELasto-VIScoplasticity in polycrystalline materials: theory, modeling, and experimental comparison.(2008), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), and Université Joseph Fourier - Grenoble 1 (UJF)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Kerr effect, Raman amplification, Physics and Astronomy (miscellaneous), Silicon, FOS: Physical sciences, chemistry.chemical_element, Silicon on insulator, Physics::Optics, 02 engineering and technology, 01 natural sciences, 010309 optics, symbols.namesake, 0103 physical sciences, Silicon waveguides, Self-phase modulation, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, 021001 nanoscience & nanotechnology, chemistry, Picosecond, symbols, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Optoelectronics, Nonlinear Optics, 0210 nano-technology, Saturation (chemistry), Raman spectroscopy, business, Optics (physics.optics), Physics - Optics
Abstract

We experimentally show that the self-phase modulation of picosecond pump pulses, induced by both the optical Kerr effect and free-carrier refraction, has a detrimental effect on the maximum on-off Raman gain achievable in silicon on insulator nanowaveguides, causing it to saturate. A simple calculation of the Raman gain coefficient from the measured broadened output pump spectra perfectly matches the saturated behavior of the amplified Raman signal observed experimentally at different input pump powers., Accepted for publications in Applied Physics Letters

Published
2010

26. Experimental investigation of a page-oriented Lippmann 'holographic' data storage system

Author

Gilles Pauliat, Kevin Contreras, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), and Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, 3D optical data storage, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Photography, Holography, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, 02 engineering and technology, Optical storage, 01 natural sciences, Multiplexing, law.invention, Holographic Data Storage System, 010309 optics, Interferometry, 020210 optoelectronics & photonics, Optics, law, Computer graphics (images), 0103 physical sciences, Computer data storage, 0202 electrical engineering, electronic engineering, information engineering, business, ComputingMethodologies_COMPUTERGRAPHICS
Abstract

International audience; Lippmann photography is a more than one century old interferometric process invented for recording colored images in thick black and white photographic emulsions. After a comparison between this photographic process and Denisyuk holography, we feature some hints to apply this technique to high density data storage by wavelength multiplexing in a page-oriented approach in thick media. For the first time we experimentally investigate this approach. We anticipated that this storage architecture should allow capacities as large as for conventional holography

Published
2010

27. Optical characterizations of a raman generator based on a hollow core photonic crystal fiber filled with a liquid

Author

Sylvie Lebrun, Philippe Delaye, Gérald Roosen, Christelle Buy, Gilles Pauliat, Robert Frey, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), and Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Materials science, Physics and Astronomy (miscellaneous), Physics::Optics, 02 engineering and technology, 7. Clean energy, 01 natural sciences, Graded-index fiber, 010309 optics, symbols.namesake, Optics, 0103 physical sciences, Plastic optical fiber, ComputingMilieux_MISCELLANEOUS, Photonic crystal, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Energy conversion efficiency, Microstructured optical fiber, 021001 nanoscience & nanotechnology, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, symbols, 0210 nano-technology, business, Raman spectroscopy, Raman scattering, Photonic-crystal fiber
Abstract

We present a Raman generator based on a 35 cm long hollow core photonic crystal fiber entirely filled with ethanol emitting on a nearly-Gaussian beam. The power conversion efficiency from the pump at 532 nm to the first Stokes order of ethanol at 630 nm is 67%. Temporal profiles, mode patterns and power stability are also analyzed.

Published
2010

28. Dynamic holographic memory showing readout, refreshing, and updating capabilities

Author

Gérald Roosen, G. Pauliat, S. Boj, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), and Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Hardware_MEMORYSTRUCTURES, Computer science, business.industry, Reading (computer), Holography, Image processing, 02 engineering and technology, Photorefractive effect, 021001 nanoscience & nanotechnology, 01 natural sciences, Multiplexing, Atomic and Molecular Physics, and Optics, law.invention, 010309 optics, Optics, law, Modulation, 0103 physical sciences, Photorefractive crystal, Holographic memory, 0210 nano-technology, business
Abstract

International audience; We propose a new refreshing procedure for reading out a dynamic holographic memory without loss of information. The retrieved images are fed back to the memory after being thresholded and amplified. Experimental demonstration is performed with a LiNbO3 photorefractive Crystal.

Published
2009

29. Wavelength-multiplexed memory based on a Lippmann architecture

Author

Gilles Pauliat, Z. Izri, Gérald Roosen, Carole Arnaud, Kevin Contreras, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), and Pauliat, Gilles

Subjects
[PHYS.PHYS.PHYS-OPTICS] Physics [physics]/Physics [physics]/Optics [physics.optics], 3D optical data storage, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Computer science, business.industry, 010401 analytical chemistry, Holography, Process (computing), ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Holographic data storage, Diffraction efficiency, 01 natural sciences, Multiplexing, Lippmann, 0104 chemical sciences, law.invention, 010309 optics, Optics, law, Wavelength-division multiplexing, 0103 physical sciences, business, Optical disc, Computer hardware
Abstract

It is well recognized that holographic data storage may represent the next generation of optical data storage. Unlike DVDs and other optical discs in which information is stored in a plane, holographic storage technologies have a volumetric memory. Among several configurations, the page-oriented architectures present great advantages, such as the high data rate that stems from their inherent parallelism [1]. In this work, we present such an architecture, based on the Lippmann photographic process [1–5], in which pages of data are stored with wavelength multiplexing.

Published
2009

30. Bragg diffraction in thin 2D refractive index modulated semiconductor samples

Author

Robert Frey, Qiong He, G. Roosen, Isabelle Zaquine, Département Traitement du Signal et des Images (TSI), Centre National de la Recherche Scientifique (CNRS)-Télécom ParisTech, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), and Télécom ParisTech-Centre National de la Recherche Scientifique (CNRS)

Subjects
PHOSFOS, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, Holographic grating, business.industry, Bragg's law, Physics::Optics, Statistical and Nonlinear Physics, Acousto-optics, 02 engineering and technology, 021001 nanoscience & nanotechnology, Distributed Bragg reflector, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, 010309 optics, Ultrasonic grating, Optics, Fiber Bragg grating, law, 0103 physical sciences, Blazed grating, 0210 nano-technology, business
Abstract

International audience; A very simple model has been developed to describe the diffractive properties of a crossed grating structure of the refractive index formed by a thin transmission grating recorded in a Bragg reflector. When the Bragg condition of the transmission grating coincides with the band edge of the reflection grating seen as a one dimensional photonic crystal, the diffraction efficiency and wavelength selectivity of the transmission grating are highly enhanced and a Bragg diffraction regime can be obtained, even in very thin samples. The model can be used to design micrometric very efficient new diffracting devices for optical signal processing

Published
2009

31. Efficient Frequency Converters Based on Stimulated Raman Scattering in Hollow Core Photonic Crystal Fibres Filled with Nonlinear Liquids

Author

Robert Frey, Philippe Delaye, Gérald Roosen, Sylvie Lebrun, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), and Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Materials science, Optical fiber, Physics::Optics, 02 engineering and technology, 7. Clean energy, 01 natural sciences, law.invention, 010309 optics, symbols.namesake, 020210 optoelectronics & photonics, Optics, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, ComputingMilieux_MISCELLANEOUS, Photonic crystal, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Nonlinear optics, Supercontinuum, symbols, Raman spectroscopy, business, Refractive index, Raman scattering, Photonic-crystal fiber
Abstract

Recent developments in the field of nonlinear optics with photonic crystal fibers have led to the realization of supercontinuum spectra or parametric sources of correlated photons. However the nonlinearities were still limited by the use of silica. Hollow core photonic crystal fibers (HCPCF) filled with highly nonlinear liquids or gases enable the implementation of more performing nonlinear devices and open the scope of potential applications thanks to the large variety of usable liquids and gases. Moreover liquid and gas filled HCPCF present several original propagation properties such as transmission bands that can be tailored to favor or prevent a given nonlinear mechanism. In this work we will show that the on-purpose limited transmission band enables a high conversion efficiency towards a single Stokes component even at high pump intensities. Moreover such Raman converters generate single spatial mode at specific wavelengths that can be determined to fit desired applications.

Published
2009

32. Light localization induced enhancement of third order nonlinearities in a GaAs photonic crystal waveguide

Author

Robert Frey, Q. Vy Tran, Sylvain Combrié, A. De Rossi, Philippe Delaye, Aleksandr Ryasnyanskiy, Nicolas Dubreuil, G. Roosen, Alexandre Baron, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), Thales Research and Technology [Palaiseau], THALES, Financement RTRA 'Le Triangle de la Physique', and Collaboration avec Thales Research and Technology

Subjects
Materials science, Kerr effect, Nonlinear optics, FOS: Physical sciences, Physics::Optics, 02 engineering and technology, Photonic crystal waveguides, 01 natural sciences, Optical switch, 010309 optics, Semiconductor materials, Multiphoton processes, 0103 physical sciences, Absorption (electromagnetic radiation), [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Nonlinear spectroscopy, 021001 nanoscience & nanotechnology, Atomic and Molecular Physics, and Optics, Third order, Nonlinear system, Group velocity, Optoelectronics, 0210 nano-technology, business, Refractive index, Physics - Optics, Optics (physics.optics)
Abstract

Nonlinear propagation experiments in GaAs photonic crystal waveguides (PCW) were performed, which exhibit a large enhancement of third order nonlinearities, due to light propagation in a slow mode regime, such as two-photon absorption (TPA), optical Kerr effect and refractive index changes due to TPA generated free-carriers. A theoretical model has been established that shows very good quantitative agreement with experimental data and demonstrates the important role that group velocity plays. These observations give a strong insight into the use of PCWs for optical switching devices., Comment: 6 pages

Published
2009

33. Detection of the tagged or untagged photons in acousto-optic imaging of thick highly scattering media by photorefractive adaptive holography

Author

François Ramaz, Albert-Claude Boccara, Max Lesaffre, Philippe Delaye, G. Roosen, Michel Gross, Laboratoire Kastler Brossel (LKB (Lhomond)), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Photons Et Matière, Université Pierre et Marie Curie - Paris 6 (UPMC)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), Université Pierre et Marie Curie - Paris 6 (UPMC)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Optical Phenomena, Breast imaging, Biophysics, Holography, FOS: Physical sciences, 02 engineering and technology, 01 natural sciences, Signal, law.invention, 010309 optics, Optics, pacs: 170.1650,170.3660,290.7050,090.0090,170.7050, law, 0103 physical sciences, Animals, Humans, Scattering, Radiation, General Materials Science, Breast, Adaptive optics, Wavefront, Physics, Photons, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Scattering, Surfaces and Interfaces, General Chemistry, Photorefractive effect, Acoustics, 021001 nanoscience & nanotechnology, Diffuse optical imaging, 0210 nano-technology, business, Chickens, Biotechnology, Optics (physics.optics), Physics - Optics
Abstract

International audience; We propose an original adaptive wavefront holographic setup based on the photorefractive effect (PR), to make real-time measurements of acousto-optic signals in thick scattering media, with a high flux collection at high rates for breast tumor detection. We describe here our present state of art and understanding on the problem of breast imaging with PR detection of the acousto-optic signal.

Published
2009

34. Dewetting During the Crystal Growth of (Cd,Zn)Te:In Under Microgravity

Author

T. Duffar, Gérald Roosen, Ernesto Diéguez, Alex Fauler, Lucio Zanotti, L. Sylla, A. Zappettini, Michael Fiederle, University of Freiburg [Freiburg], Science et Ingénierie des Matériaux et Procédés (SIMaP), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Universidad Autonoma de Madrid (UAM), CNR-IMSEM, Consiglio Nazionale delle Ricerche (CNR), Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), and Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Nuclear and High Energy Physics, Materials science, Analytical chemistry, chemistry.chemical_element, Crucible, Crystal growth, 02 engineering and technology, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, Crystal, Phase (matter), 0103 physical sciences, Dewetting, Electrical and Electronic Engineering, ComputingMilieux_MISCELLANEOUS, 010302 applied physics, business.industry, Doping, X-ray detectors, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Semiconductor, Nuclear Energy and Engineering, chemistry, Melting point, CdZnTe, CZT growth, CZT characterization, 0210 nano-technology, Tellurium, business, CZT detectors
Abstract

The phenomenon of ldquodewettingrdquo associated with the Vertical Bridgman (VB) crystal growth technique leads to the growth of a crystal without contact with the crucible. One dramatic consequence of this modified VB process is the reduction of structural defects within the crystal. It has been observed in several microgravity experiments for different semiconductor crystals. This work is concentrated on the growth of high resistivity (Cd,Zn)Te:In (CZT) crystals by achieving the phenomenon of dewetting under microgravity condition and its application in the processing of CZT detectors. Two Cd0.9Zn0.1Te:In crystals were grown in space on the Russian FOTON satellite in the POLIZON-M facility in September 2007 (mission M3). At the end of the preliminary melting phase of one crystal, a Rotating Magnetic Field (RMF) was applied in order to reduce the typical tellurium clusters within the melt before the pulling. The other crystal was superheated with 20 K above the melting point before the pulling. A third reference crystal has been grown on the ground in similar thermal conditions. Profiles measurements of the space grown crystals surface gave the evidence of a successful dewetting during the crystal growth. Characterization methods such as IR microscopy and CoReMa have been performed on the three crystals. CZT detectors have been processed from the grown part of the different crystals. The influence of the dewetting on the material quality and the detector properties completes the study.

Published
2009

35. Polarization independent phase demodulation using photorefractive two-wave mixing

Author

Philippe Delaye, Jean-Pierre Monchalin, Gérald Roosen, Denis Drolet, Alain Blouin, Louis-Anne de Montmorillon, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), Industrial Materials Institute (NRCC), and National Research Council of Canada (NRC)

Subjects
Physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Multi-mode optical fiber, Physics and Astronomy (miscellaneous), business.industry, Physics::Optics, Photodetector, 02 engineering and technology, Photorefractive effect, 021001 nanoscience & nanotechnology, Holographic interferometry, Polarization (waves), 01 natural sciences, 010309 optics, Interferometry, Optics, 0103 physical sciences, Demodulation, Optoelectronics, 0210 nano-technology, business, Phase modulation
Abstract

International audience; We describe both theoretically and experimentally a polarization independent interferometric adaptive photodetector based on photorefractive two-wave mixing. The configuration is based on the simultaneous recording of two independent gratings in a single photorefractive crystal. Applied to the detection of ultrasonic signals, this interferometric photodetector operates with depolarized beams issued from multimode fibers and gives a detection limit close to the ultimate.

Published
1999

36. Efficient Bragg diffraction in thin semiconductor two-dimensional gratings

Author

Isabelle Zaquine, Robert Frey, Gérald Roosen, Régis André, Qiong He, Département Traitement du Signal et des Images (TSI), Télécom ParisTech-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), Nanophysique et Semiconducteurs (NPSC), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)

Subjects
PHOSFOS, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, Holographic grating, business.industry, Bragg's law, Physics::Optics, Acousto-optics, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, 010309 optics, Ultrasonic grating, Optics, Fiber Bragg grating, law, 0103 physical sciences, Blazed grating, Optoelectronics, Diffraction topography, 0210 nano-technology, business
Abstract

International audience; Highly improved diffraction properties are demonstrated in a two-dimensional [2D] grating consisting of a transmission grating optically recorded in a semiconductor one-dimensional photonic crystal (1D-PC). Near unity internal diffraction efficiency, high wavelength selectivity, and Bragg diffraction regime operation are demonstrated when the read beam is set at Bragg incidence on the transmission grating while its wavelength corresponds to the band edge of the 3 um thick 1D-PC. When the 2D grating is grown on a Bragg mirror, a single diffracted beam is obtained, which makes the device promising for optical signal processing

Published
2008

37. Fourier transformed picosecond synchronously pumped Optical Parametric Oscillator without spectral filtering element

Author

Philippe Delaye, Robert Frey, Gérald Roosen, Aleksandr Ryasnyanskiy, Nicolas Dubreuil, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), Financement RTRA 'Le Triangle de la Physique', Projet ANR MIRAMAN, and Modes lents optiques et effets linéaires et nonlinéaires dans des nanostructures silicium : application au laser Raman silicium, MIRAMAN, ANR-06-NANO-000-30,Modes lents optiques et effets linéaires et nonlinéaires dans des nanostructures silicium : application au laser Raman silicium, MIRAMAN, ANR-06-NANO-000-30

Subjects
Materials science, Infrared, Physics::Optics, 02 engineering and technology, 01 natural sciences, Signal, law.invention, 010309 optics, symbols.namesake, chemistry.chemical_compound, Optics, law, 0103 physical sciences, optical parametric oscillator, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, 021001 nanoscience & nanotechnology, Laser, Optical parametric amplifier, Atomic and Molecular Physics, and Optics, Fourier transform, chemistry, Picosecond, Lithium tantalate, symbols, Optical parametric oscillator, PPSLT crystal, 0210 nano-technology, business
Abstract

5 pages; International audience; An optical parametric oscillator for the infrared region pumped by a picosecond Ti:Sapphire laser is demonstrated. Fourier transform limited pulses of 15 and 10 ps, for signal and idler wavelengths respectively, have been obtained using a periodically poled stoechiometric lithium tantalate nonlinear crystal, without any spectral filtering. A complete experimental study of the influence of the cavity length detuning on the spectral and temporal dynamic of the output radiation is discussed.

Published
2008

38. Time resolved nonlinear spectroscopy at the band edge of 1D photonic crystals

Author

Magali Astic, Nadia Belabas, Philippe Delaye, Régis André, Isabelle Sagnes, Rama Raj, Gérald Roosen, Robert Frey, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), Nanophysique et Semiconducteurs (NPSC), Institut Néel (NEEL), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), Laboratoire de photonique et de nanostructures (LPN), Centre National de la Recherche Scientifique (CNRS), ACI Nanosciences, and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)

Subjects
Acoustics and Ultrasonics, Physics::Optics, Nonlinear spectroscopy, Edge (geometry), 01 natural sciences, 010309 optics, Optics, 0103 physical sciences, 010306 general physics, Photonic crystal, Signal processing, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Chemistry, business.industry, nonlinear optics, Nonlinear optics, Condensed Matter Physics, Free carrier, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Intensity (physics), three photon absorption, photonic crystals, sense organs, business, Refractive index
Abstract

International audience; Large refractive index changes have been measured at the band edge frequency of 1D photonic crystals. Results concerning both thin and thick samples of high and low refractive index contrast respectively are presented. The very large value of the refractive index changes obtained at moderate pump powers thanks to the strong enhancement of the local intensity inside the photonic crystal open the way to very small volume devices for optical signal processing. However, time-resolved experiments demonstrate the photo-generation of high free carrier densities through two- or even three-photon absorptions which are shown to be also strongly enhanced at the band edge of the photonic crystal. This drawback may the most probably be circumvented by using lower pump intensities in photonic crystals showing narrower resonances.

Published
2008

39. Why Raman amplification ?

Author

Robert Frey, Daniel Dolfi, Philippe Delaye, Thomas Merlet, Mehdi Alouini, J.-P. Huignard, Institut de Physique de Rennes (IPR), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), Thales Research and Technology [Palaiseau], THALES [France], Thales Air Systems, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), DGA, Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), THALES, and Thales Group [France]

Subjects
Optical amplifier, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Optical fiber, Materials science, Raman amplification, business.industry, chemistry.chemical_element, Physics::Optics, 02 engineering and technology, Population inversion, 01 natural sciences, Noise (electronics), law.invention, 010309 optics, Erbium, 020210 optoelectronics & photonics, Optics, chemistry, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Radio frequency, Stimulated emission, business
Abstract

International audience; Raman amplification of optically carried RF signals is shown to be a good alternative to erbium-doped-fiber amplification. In the case of continuous RF signal, RIN levels as low as -160 dB/Hz, limited by the laser source, are obtained. Moreover, when the RF signal is no more continuous, such as real radar waveforms, we evidence that Raman amplification overcomes erbium-doped-fiber amplification. Improvement of the pulse-to-pulse RF phase stability of 17 dB is observed. This result is attributed to the nature of Raman amplification, which does not involve transient variations of the population inversion across the whole spectral range covered by radar waveforms.

Published
2008

40. Numerical modeling of high-power self-organizing external cavity lasers

Author

Gilles Pauliat, A.J. Kent, N. Dubreuil, Eric C. Larkins, P.J. Bream, Slawomir Sujecki, Z. Zhang, J.J. Lim, The School of Electronic and Electrical Engineering, University of Nottingham, UK (UON), Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), European Project: 34338,WWW.BRIGHTER.EU, and Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Plane wave, Physics::Optics, 02 engineering and technology, 01 natural sciences, law.invention, 010309 optics, Longitudinal mode, 020210 optoelectronics & photonics, Optics, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Physics::Atomic Physics, Laser power scaling, Electrical and Electronic Engineering, ComputingMilieux_MISCELLANEOUS, Optical amplifier, Physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Amplifier, Injection seeder, Laser, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Physics::Accelerator Physics, Optoelectronics, business, Tunable laser
Abstract

A self-consistent model of a self-organizing external cavity high power laser is presented. The model consists of a photorefractive crystal model, which relies on the plane wave approximation, and of a spectral model of the tapered laser amplifier. The results show that the laser can operate in a single longitudinal mode.

Published
2008

41. Application of Lippmann interference photography to data storage

Author

Kevin Contreras, Gilles Pauliat, Carole Arnaud, Gérald Roosen, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), and Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Computer science, Photography, Volume (computing), Process (computing), 02 engineering and technology, Holographic data storage, 01 natural sciences, Multiplexing, Atomic and Molecular Physics, and Optics, 010309 optics, Wavelength, 020210 optoelectronics & photonics, Optics, Interference (communication), 0103 physical sciences, Computer data storage, 0202 electrical engineering, electronic engineering, information engineering, business
Abstract

International audience; Lippmann's interference photography is an elegant process to record coloured images in the volume of a sensitive material. We propose to use this technique for wavelength multiplexed data storage in a page-oriented approach. Using computer simulations, we demonstrate that the capacities reached with this technique are similar to those reached by volume holographic data storage.

Published
2008

42. Frequency and wavelength dependencies of the electro-optic coefficients in SBN:60 single crystal

Author

Jean-Paul Salvestrini, Mustapha Abarkan, Marc D. Fontana, Mireille Cuniot-Ponsard, Laboratoire Matériaux Optiques, Photonique et Systèmes (LMOPS), Université de Lorraine (UL)-CentraleSupélec, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), and Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Quantum optics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, Physics and Astronomy (miscellaneous), business.industry, General Engineering, General Physics and Astronomy, Ranging, 02 engineering and technology, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, law.invention, 010309 optics, Wavelength, Optics, law, Optical materials, 0103 physical sciences, 0210 nano-technology, business, Single crystal
Abstract

International audience; We report the dependence of the high and low frequency values of the linear electro-optic (EO) coefficient rc = r33 −(no/ne)3r13 of Sr0.6Ba0.4Nb2O6 (SBN:60) single crystal on the laser wavelength. The EO response has been carried out from dc to 150 MHz for four wavelengths ranging from 465 to 1321 nm. The clamped rS and unclamped rT coefficients have been determined and their dispersions as a function of wavelength have been established and discussed.

Published
2008

43. Experimental investigation of intracavity Bragg gratings

Author

Robert Frey, L. Menez, Isabelle Zaquine, Alain Maruani, Département Traitement du Signal et des Images (TSI), Télécom ParisTech-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Télécom ParisTech

Subjects
Diffraction, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], PHOSFOS, Materials science, business.industry, Physics::Optics, Grating, Diffraction efficiency, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, 010309 optics, Resonator, Ultrasonic grating, Optics, Fiber Bragg grating, law, 0103 physical sciences, Blazed grating, Optoelectronics, 010306 general physics, business
Abstract

International audience; We report the results of an experimental investigation of the diffractive properties of a thick index grating embedded in a Fabry-Perot resonator, the so-called intracavity Bragg grating. We compare the performance of this device with that of a bare Bragg grating with same thickness and the same index modulation and establish the improvement in performance with the resonator. The experimental data also fit predictions calculated from a theoretical model.

Published
2007

44. Homodyne detection for Lippmann data storage

Author

Frédéric Guattari, Gilles Pauliat, Christiane Carre, Carole Arnaud, Kevin Contreras, Gérald Roosen, Safi Jradi, Guillaume Maire, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), Département de Photochimie Générale (DPG), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS), Fonctions Optiques pour les Technologies de l'informatiON (FOTON), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Télécom Bretagne-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), and Université de Rennes (UNIV-RENNES)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Télécom Bretagne

Subjects
Physics, 3D optical data storage, Pixel, business.industry, Holography, [CHIM.MATE]Chemical Sciences/Material chemistry, 02 engineering and technology, Optical storage, 021001 nanoscience & nanotechnology, 01 natural sciences, law.invention, 010309 optics, Direct-conversion receiver, 020210 optoelectronics & photonics, Homodyne detection, law, 0103 physical sciences, Computer data storage, 0202 electrical engineering, electronic engineering, information engineering, White light, Electronic engineering, 0210 nano-technology, business
Abstract

We propose an homodyne geometry to improve the efficiency of Lippmann data storage and simplify its architecture: the Lippmann mirror required for recording is kept in place for data retrieving.

Published
2007

45. Single-mode output power enhancement of an extended cavity broad-area laser diode by an intracavity photorefractive crystal

Author

Daniel Rytz, G. Roosen, Vincent Reboud, Gilles Pauliat, Nicolas Dubreuil, Pierre Fournet, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), FEE, FEE GmBh, and Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Brightness, Materials science, Physics and Astronomy (miscellaneous), Holography, General Physics and Astronomy, Physics::Optics, 02 engineering and technology, 01 natural sciences, Semiconductor laser theory, law.invention, 010309 optics, 020210 optoelectronics & photonics, Optics, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, 42.40.Eq, 42.65.Hw, 42.55.Px, Optical amplifier, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Laser diode, business.industry, General Engineering, Single-mode optical fiber, Photorefractive effect, Laser, Optoelectronics, business
Abstract

International audience; Brightness improvement of high-power semiconductor lasers can be achieved by placing a broad-area laser diode, used as a pure optical amplifier, in an extended cavity. We report the modal behavior of an extended cavity which contains a photorefractive crystal. The dynamic holographic medium that plays the role of a spatial and spectral filter acts on the transverse and axial structure of the extended cavity modes and improves the single-mode operating range of the laser. An enhancement of the brightness in single-mode operation by a factor of seven has been experimentally observed thanks to the intracavity photorefractive crystal.

Published
2007

46. Intracavity gain gratings

Author

Robert Frey, Alain Maruani, Quiong He, Aurelie Moreau, Isabelle Zaquine, Laboratoire Traitement et Communication de l'Information (LTCI), Télécom ParisTech-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), and Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Diffraction, Optical amplifier, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, business.industry, Physics::Optics, 02 engineering and technology, Diffraction efficiency, Laser, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, 010309 optics, Finesse, 020210 optoelectronics & photonics, Optics, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Optoelectronics, Physics::Atomic Physics, business, Diffraction grating, Lasing threshold, Fabry–Pérot interferometer
Abstract

International audience; Intracavity gain gratings are theoretically demonstrated to exhibit diffraction efficiencies that are 100 times larger than unity at pump powers substantially below the lasing threshold. Experiments performed using a Nd:YVO4 microlaser pumped below threshold by two interfering Ti:sapphire laser beams are described. Huge enhancement of the diffraction efficiency (5000x) and a large increase of the angular selectivity (10x) are demonstrated despite the angular reduction of the Fabry-Perot cavity finesse. Much better results are expected using gain gratings with larger areas or thinner cavities such as vertical cavity surfaceemitting lasers. Such large fan-out values could be very interesting for applications to optical signal processing.

Published
2007

47. Self-organizing laser cavities

Author

Gérald Roosen, Gilles Pauliat, Nicolas Dubreuil, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11), and Peter Günter, Jean Pierre Huignard

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, business.industry, 02 engineering and technology, Output coupler, Laser, 01 natural sciences, law.invention, 010309 optics, 020210 optoelectronics & photonics, law, Optical cavity, 0103 physical sciences, Photorefractive crystal, 0202 electrical engineering, electronic engineering, information engineering, Optoelectronics, business, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2007

48. Second harmonic generation in the near field and far field, a sensitive tool to probe crystalline homogeneity

Author

Laurent Mahieu-Williame, Mireille Cuniot-Ponsard, Claude Boccara, Samuel Gresillon, Laboratoire d'Optique Physique (UPR0005) (LOP), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), and Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut d'Optique Graduate School (IOGS)-Université Paris-Sud - Paris 11 (UP11)

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, business.industry, General Physics and Astronomy, Second-harmonic generation, Near and far field, 02 engineering and technology, 021001 nanoscience & nanotechnology, 01 natural sciences, law.invention, Scanning probe microscopy, Optics, Optical microscope, law, 0103 physical sciences, Homogeneity (physics), Surface second harmonic generation, Near-field scanning optical microscope, Thin film, 010306 general physics, 0210 nano-technology, business
Abstract

International audience; In order to probe crystalline orientation of SrxBa1−xNb2O6 _SBN:x_ thin film, we have developed a detection scheme based on a scanning near-field optical microscope _SNOM_. It is used to image simultaneously the fundamental and the second harmonic generation _SHG_ of light by the sample under pulsed laser illumination. We demonstrate on SBN thin films that an apertureless SNOM can dramatically improve the resolution and the sensitivity of SNOM-SHG. Tip direction and focalization are the two crucial parameters in the SNOM-SHG experiments. Moreover, we show the ability of our setup to separate near field from far field contribution to the SHG. This is indeed very helpful in order to measure surface-SHG coefficients.

Published
2007

49. Two-wave mixing in an erbium-doped fiber amplifier for modulation depth enhancement of optically carried microwave signals

Author

S. Norcia-Molin, Robert Frey, Daniel Dolfi, J.-P. Huignard, S. Tonda-Goldstein, Thales Research and Technologies [Orsay] (TRT), THALES, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), and Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010302 applied physics, Optical amplifier, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, Optical fiber, business.industry, Attenuation, Physics::Optics, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, 010309 optics, Amplitude modulation, Optics, Optical modulator, Optical Carrier transmission rates, Modulation, law, 0103 physical sciences, business, Microwave
Abstract

International audience; We experimentally and theoretically analyze an original method based on two-wave mixing in an erbiumdoped fiber amplifier for optical carrier reduction of microwave signals. 75% optical carrier attenuation has been observed, and a 10 dB modulation depth increase of the microwave signal is experimentally demonstrated. Moreover, calculated results are in good agreement with measurements and predict that up to 80% carrier attenuation is easily possible.

Published
2006

50. Self-induced transverse mode selection in a photorefractive extended cavity laser diode

Author

Daniel Rytz, Gérald Roosen, Nicolas Dubreuil, Pierre Fournet, Vincent Reboud, Gilles Pauliat, Laboratoire Charles Fabry de l'Institut d'Optique / Manolia, Laboratoire Charles Fabry de l'Institut d'Optique (LCFIO), Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), FEE, and FEE GmBh

Subjects
Distributed feedback laser, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, Laser diode, business.industry, Physics::Optics, 02 engineering and technology, Photorefractive effect, Laser pumping, Injection seeder, 021001 nanoscience & nanotechnology, Laser, 01 natural sciences, Atomic and Molecular Physics, and Optics, Transverse mode, Vertical-cavity surface-emitting laser, law.invention, 010309 optics, Optics, law, 0103 physical sciences, Optoelectronics, 0210 nano-technology, business
Abstract

International audience; Previous works on photorefractive self-organizing laser cavities were about lasers that oscillate, prior the self-organization process occurs, on a set of axial modes sharing the same transverse structure. In a welldesigned broad-area laser diode extended cavity, we theoretically and experimentally demonstrate that the insertion of a photorefractive crystal can also affect the transverse modal structure to force the laser, initially oscillating on several transverse modes, to oscillate on a single transverse and axial mode. This spatial self-organization process leads to an enhancement of the single mode operating range of the laser.

Published
2006

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