30 results on '"Martin Maurel"'
Search Results
2. High non-linearities effects on pulse quality in a CPA system and mitigation strategies
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Martin Maurel, Evelyne Brown-Dussault, Mathieu Gagnon, Sylvain Boudreau, Alain Mailloux, Samuel Gouin, Pascal Deladurantaye, and François Trépanier
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- 2023
3. Fabrication and characterization of iodine photonic microcells for sub-Doppler spectroscopy applications
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Clément Goïcoechéa, Thomas Billotte, Matthieu Chafer, Martin Maurel, Jenny Jouin, Philippe Thomas, Devang Naik, Frédéric Gérôme, Benoît Debord, and Fetah Benabid
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Atomic and Molecular Physics, and Optics - Abstract
We report on the development of all-fiber stand-alone iodine-filled photonic microcells demonstrating record absorption contrast at room temperature. The microcell’s fiber is made of inhibited coupling guiding hollow-core photonic crystal fibers. The fiber-core loading with iodine was undertaken at 10−1-10−2mbar vapor pressure using what, to the best of our knowledge, is a novel gas-manifold based on metallic vacuum parts with ceramic coated inner surfaces for corrosion resistance. The fiber is then sealed on the tips and mounted on FC/APC connectors for better integration with standard fiber components. The stand-alone microcells display Doppler lines with contrasts up to 73% in the 633 nm wavelength range, and an off-resonance insertion loss between 3 to 4 dB. Sub-Doppler spectroscopy based on saturable absorption has been carried out to resolve the hyperfine structure of the P(33)6-3 lines at room temperature with a full-width at half maximum of 24 MHz on the b4 component with the help of lock-in amplification. Also, we demonstrate distinguishable hyperfine components on the R(39)6-3 line at room temperature without any recourse to signal-to-noise ratio amplification techniques.
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- 2023
4. Plasma and fiber spatial multi-mode initiated stable soliton self-compression and spectral bouncing in air-filled Kagome HCPCF
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Fetah Benabid, Foued Amrani, Ihar Babushkin, Frédéric Gérôme, Benoit Debord, Martin Maurel, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), GLOphotonics S.A.S., Institute of Quantum Optics [Hannover], Leibniz Universität Hannover [Hannover] (LUH), and Gerome, Frédéric
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Physics ,[SPI.OPTI] Engineering Sciences [physics]/Optics / Photonic ,business.industry ,02 engineering and technology ,Plasma ,Astrophysics::Cosmology and Extragalactic Astrophysics ,021001 nanoscience & nanotechnology ,01 natural sciences ,Redshift ,Pulse (physics) ,Blueshift ,010309 optics ,symbols.namesake ,Optics ,Physics::Plasma Physics ,Fiber laser ,0103 physical sciences ,symbols ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Soliton ,0210 nano-technology ,business ,Raman spectroscopy ,Raman scattering - Abstract
International audience; We report on a nonlinear compression down to 20 fs in air-filled HCPCF. Novel spectraltemporal dynamic is demonstrated. Spectral bouncing of the compressed pulse is triggered by the interplay between Raman redshift and plasma blueshift.
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- 2021
5. Single-mode inhibited-coupling fiber for sub-Doppler spectroscopy
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Martin Maurel, Frederic Delahaye, Matthieu Chafer, Simon Bernon, Thomas Billotte, Benoit Debord, Adele Hilico, Frederic Gerome, Philippe Bouyer, Fetah Benabid, Vincent Mancois, Guillaume Baclet, Foued Amrani, Jonas H. Osório, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Photonique, Numérique et Nanosciences (LP2N), Université de Bordeaux (UB)-Institut d'Optique Graduate School (IOGS)-Centre National de la Recherche Scientifique (CNRS), and GLOphotonics S.A.S.
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Materials science ,Optical fiber ,business.industry ,Single-mode optical fiber ,Physics::Optics ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,law.invention ,010309 optics ,Coupling (electronics) ,Physics::Plasma Physics ,law ,Fiber laser ,0103 physical sciences ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Optoelectronics ,Fiber ,Photonics ,0210 nano-technology ,business ,Free-space optical communication ,Photonic-crystal fiber - Abstract
International audience; We report on the use and qualification of the recently developed single-mode hybrid hollow-core photonic crystal fiber for a robust and long-life acetylene photonic micro-cell based optical frequency reference.
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- 2021
6. Phase Shift Induced Degradation of Polarization Caused by Bends in Inhibited-Coupling Guiding Hollow-Core Fibers
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Benoit Debord, Christian Rohrer, Marwan Abdou Ahmed, Thomas Graf, Jonas H. Osório, Frédéric Gérôme, Frieder Beirow, Fetah Benabid, Martin Maurel, Université de stuttgart, Université de Stuttgart, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), and Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)
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Hollow core ,hollow-core fibers ,Materials science ,Computer simulation ,photonic crystal fibers ,Linear polarization ,Bend radius ,Physics::Optics ,02 engineering and technology ,Polarization (waves) ,01 natural sciences ,Molecular physics ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,010309 optics ,020210 optoelectronics & photonics ,0103 physical sciences ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,0202 electrical engineering, electronic engineering, information engineering ,Perpendicular ,Electrical and Electronic Engineering ,polarization-maintaining fibers ,Laser beams ,Fiber properties ,Photonic-crystal fiber - Abstract
International audience; We report on a comprehensive analysis of the polarization-maintaining behavior of two different kinds of inhibited-coupling guiding hollow-core fibers and the influence of fiber bends. A phase shift induced degradation of the incident linear polarization state was observed due to a mismatch of the propagation constants of the orthogonally polarized LP01-modes of the fiber. This effect was predicted theoretically and is corroborated with numerical simulations and experimental results. It is shown that the phase shift is enhanced by a reduction of the bending radius of the fiber, but can be circumvented by orienting the polarization of the injected beam either parallel or perpendicular to the plane of bending.
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- 2019
7. 100-fs GHz burst laser
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Foued Amrani, Eric Mottay, Axel Chambinaud, Fetah Benabid, Eric Audouard, Inka Manek-Hönninger, Clemens Hönninger, Martin Maurel, Guillaume Bonamis, Konstantin Mishchik, and John J. Lopez
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Materials science ,Laser ablation ,Silicon ,business.industry ,Physics::Optics ,chemistry.chemical_element ,Laser ,Semiconductor laser theory ,law.invention ,chemistry ,law ,Pulse compression ,Femtosecond ,Sapphire ,Optoelectronics ,Physics::Atomic Physics ,business ,Ultrashort pulse - Abstract
We report on a 100-fs GHz burst laser with up to 100-W average output power. This laser is based on a Tangor femtosecond laser with GHz burst option followed by nonlinear pulse compression in a gas-filled hollow core Kagome fiber. Combining pulse compression with hollow core fiber transport is an attractive extension for industrial femtosecond lasers. Laser ablation of metals, silicon, and sapphire have been performed with this new laser source in order to study the impact of the ultrashort pulse duration on the laser matter interaction with GHz bursts.
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- 2021
8. Recent Advances in Inhibited-Coupling Guiding Hollow-Core Optical Fibers
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Jean-Marc Blondy, Frederic Gerome, Jonas H. Osório, Fetah Benabid, Martin Maurel, Frederic Delahaye, Matthieu Chafer, Christine Restoin, Foued Amrani, Benoit Debord, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), and GLOphotonics S.A.S.
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Optical fiber ,Materials science ,Infrared ,photonic-crystal fibers ,Physics::Optics ,02 engineering and technology ,Integrated circuit ,medicine.disease_cause ,01 natural sciences ,law.invention ,010309 optics ,020210 optoelectronics & photonics ,law ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,medicine ,fiber optics ,Hollow core ,hollow-core fibers ,business.industry ,Polarization (waves) ,Cladding (fiber optics) ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Optoelectronics ,business ,Ultraviolet - Abstract
International audience; In this talk, we report on recent developments on inhibited-coupling guiding hollow-core optical fibers ranging from the understanding of the guidance mechanism to application fields. We show that a deep understanding of the cladding properties of those fibers allow to obtain fibers with optimized properties. In particular, we demonstrate that, by adequately designing and controlling the fiber physical parameters, one can obtain ultralow loss fibers for the ultraviolet, visible and infrared ranges. Additionally, we show that convenient alterations in the fiber cladding can modify the fiber mode loss hierarchy allowing it to act as a mode shaper, and polarization discriminator.
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- 2019
9. Contaminant free end-capped acetylene PMC for sub-Doppler spectroscopy
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Benoit Debord, Fetah Benabid, Thomas Billotte, Matthieu Chafer, Frédéric Gérôme, Foued Amrani, Martin Maurel, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), GLOphotonics S.A.S., OSA, and Gerome, Frédéric
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Fabrication ,Optical fiber ,Materials science ,[SPI.OPTI] Engineering Sciences [physics]/Optics / Photonic ,business.industry ,Electromagnetically induced transparency ,Laser ,law.invention ,Outgassing ,13. Climate action ,law ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Optoelectronics ,Photonics ,business ,Spectroscopy ,Absorption (electromagnetic radiation) ,ComputingMilieux_MISCELLANEOUS - Abstract
Gas-filled Hollow Core Photonic Cristal Fibres (HCPCF) or Photonic MicroCell (PMC) [1] has proven to offer an outstanding gas-cell for laser metrology and spectroscopy applications. Sub-Doppler spectral features, generated via electromagnetically induced transparency (EIT) or saturated absorption (SA), have been generated in molecular gases despite the weak strength of their optical transitions [1–4], and an optical frequency reference with excellent accuracy has been demonstrated [1]. So far, the reported stand-alone PMCs are either made by hermetically splicing the HCPCF tips to an all-solid optical fibre [1,2] or by encapsulating them to a glass cell [3]. All these techniques show limitations. For example, the splicing based all-fibre PMC technique is not adapted to all fibres as it requires matching the outer-diameter and/or mode-field-diameters of the two fibres. Also the use of fibre tapering to reduce this mismatch [2] remains too cumbersome for the obtained splice-loss figures, which are >2 dB and exhibit asymmetric loss. Furthermore, the use of Helium (He) gas during the "air-ambient" splicing process to avoid air pollution in the fibre core renders this technique too sensitive to residual gas contamination. Conversely, the technique of encapsulating the fibre tip in an enlarged borosilicate capillary [3] presents potential contamination during and after fabrication because of the use of Epoxy glue, and the ensued outgassing, which is detrimental for optimized observation of sub-Doppler features and for the life time of the PMC.
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- 2019
10. Scalable hollow fiber pulse compressor for NIR and UV lasers
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Benoit Debord, Matthieu Chafer, Martin Maurel, Benoit Beaudou, Frédéric Gérôme, Foued Amrani, Fetah Benabid, GLOphotonics S.A.S., Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), and Gerome, Frédéric
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Materials science ,[SPI.OPTI] Engineering Sciences [physics]/Optics / Photonic ,Physics::Optics ,02 engineering and technology ,01 natural sciences ,law.invention ,010309 optics ,Kagome HC-PCF ,law ,Soliton ,0103 physical sciences ,Dispersion (optics) ,Fiber ,business.industry ,Compression ,021001 nanoscience & nanotechnology ,Laser ,USP laser ,Pulse (physics) ,Pulse compression ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Optoelectronics ,0210 nano-technology ,business ,Gas compressor ,Pulse-width modulation ,Photonic-crystal fiber - Abstract
International audience; We report on several ultra-short pulse compression schemes based on hollow-core photonic crystal fiber filled with a chosen gas-phase medium and undertaken in a versatile module coined "FastLas". The scheme relies on dispersion management by both fiber design and gas pressure management to offer a highly versatile pulse compressor. Furthermore, the gas is also used to set the required optical nonlinearity. This type of hollow fiber based compressor is scalable with the laser wavelength, pulse energy and initial pulse-width. Among the achieved pulse compression, we list a self-compression of 500-600 fs ultra-short pulse Yb-laser and with energy range of 10-500 µJ. By simply scaling the fiber length we demonstrated pulses as short as ~20 fs for the whole energy range. Here, the self-compression is achieved through solitonic dynamic. Conversely, we demonstrated pulse compression based on self-phase modulation by adjusting the fiber and gas dispersion. Among the pulse compressors we have developed, based on self-phase modulation, we cite the compression of a frequency-tripled micro-Joule pulse-energy Yb-laser with a pulse width of 250 fs. The results show compressed UVpulses with temporal width in the range of 50-60 fs.
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- 2019
11. Tailoring modal properties of inhibited-coupling guiding fibers by cladding modification
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Jonas H. Osório, Foued Amrani, Fetah Benabid, Fabio Giovanardi, Luca Vincetti, Frederic Gerome, Benoit Debord, Frederic Delahaye, Matthieu Chafer, Martin Cordier, Martin Maurel, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), GLOphotonics S.A.S., Laboratoire Traitement et Communication de l'Information (LTCI), and Télécom ParisTech-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)
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0301 basic medicine ,Optical fiber ,Materials science ,FOS: Physical sciences ,lcsh:Medicine ,Physics::Optics ,Orbital overlap ,Article ,law.invention ,03 medical and health sciences ,0302 clinical medicine ,law ,lcsh:Science ,Multidisciplinary ,business.industry ,lcsh:R ,Nonlinear optics ,Cladding (fiber optics) ,Polarization (waves) ,030104 developmental biology ,Modal ,Optical Fibers, Photonic Crystal Fibers, Hollow core fibers ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Atom optics ,Optoelectronics ,lcsh:Q ,business ,030217 neurology & neurosurgery ,Optics (physics.optics) ,Physics - Optics ,Photonic-crystal fiber - Abstract
Understanding cladding properties is crucial for designing microstructured optical fibers. This is particularly acute for Inhibited-Coupling guiding fibers because of the reliance of their core guidance on the core and cladding mode-field overlap integral. Consequently, careful planning of the fiber cladding parameters allows obtaining fibers with optimized characteristics such as low loss and broad transmission bandwidth. In this manuscript, we report on how one can tailor the modal properties of hollow-core photonic crystal fibers by adequately modifying the fiber cladding. We show that the alteration of the position of the tubular fibers cladding tubes can alter the loss hierarchy of the modes in these fibers, and exhibit salient polarization propriety. In this context, we present two fibers with different cladding structures which favor propagation of higher order core modes – namely LP11 and LP21 modes. Additionally, we provide discussions on mode transformations in these fibers and show that one can obtain uncommon intensity and polarization profiles at the fiber output. This allows the fiber to act as a mode intensity and polarization shaper. We envisage this novel concept can be useful for a variety of applications such as hollow core fiber based atom optics, atom-surface physics, sensing and nonlinear optics.
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- 2019
12. 1 km long hollow-core fiber with losses at the silica Rayleigh limit in the green spectral region
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Jonas H. Osório, Fetah Benabid, Benoit Debord, Foued Amrani, Frederic Gerome, Martin Maurel, Frederic Delahaye, Matthieu Chafer, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), and GLOphotonics S.A.S.
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Fabrication ,Optical fiber ,Materials science ,02 engineering and technology ,Fiber optics ,01 natural sciences ,law.invention ,010309 optics ,symbols.namesake ,Optics ,law ,Lattice (order) ,0103 physical sciences ,Electrical and Electronic Engineering ,Rayleigh scattering ,hollow-core fiber ,business.industry ,021001 nanoscience & nanotechnology ,Cladding (fiber optics) ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Amorphous solid ,symbols ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,0210 nano-technology ,business ,photonic crystal fiber ,Rayleigh limit ,Photonic-crystal fiber - Abstract
International audience; In this letter, we report on the fabrication of an inhibited-coupling guiding fiber with a cladding amorphous lattice of nine tubes exhibiting a record loss of 13.8 dB/km at 539 nm. The fiber has been drawn over a length of 1 km with high stability during the drawing process (outer diameter variation of ±0.2%). To our knowledge, this is the first time that loss figures and the fundamental Rayleigh scattering limit of silica are reported for a hollow-core optical fiber in the green spectral range. Also, this is the first report on a tubular fiber draw over such a long length. Additionally, this record loss figure is the lowest ever demonstrated with any kind of optical fibers in the green spectral range.
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- 2019
13. Soliton self-compression in air filled Kagome HCPCF
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Fetah Benabid, Benoit Debord, Martin Maurel, Foued Amrani, Frédéric Gérôme, Gerome, Frédéric, GLOphotonics S.A.S., Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), and Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)
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Physics ,[SPI.OPTI] Engineering Sciences [physics]/Optics / Photonic ,Dynamic range ,Soliton (optics) ,Laser ,7. Clean energy ,Supercontinuum ,law.invention ,Wavelength ,Pulse compression ,Modulation ,law ,Dispersion (optics) ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Atomic physics ,ComputingMilieux_MISCELLANEOUS - Abstract
Hollow-core photonic crystal fibre (HCPCF) proved to be a powerful platform for optical pulse compression. Several results, reported in the last few years, show both exceptional compression performances over a large energy dynamic range and varied experimental conditions [1][2][3], and new physical dynamics [4]. Among the reported performances, we list those achieved with Inhibited-Coupling guiding HCPCF (IC-HCPCF), and where soliton self-compression down to the single or a few cycle regime were achieved with a ∼1.8 μm wavelength and 80 fs duration input-pulse [1], and with a 790 nm wavelength and 24 fs duration input-pulse [2]. Conversely, the low values and spectral profile of the IC-HCPCF dispersion, combined with its fine control through a judicious choice of a filling gas, enabled the observation of several nonlinear optical regimes as varied as modulation instability, self-phase modulation, supercontinuum generation, or plasma-induced soliton blue-shift and fission. Remarkably, in the latter regime, experimental and theoretical results show that soliton-plasma interaction and its high sensitivity to the input laser and IC-HCPCF parameters are overarching several novel solitonic phenomena[4]-[6] such as strong soliton self-compression, blue and red frequency-shift and fission.
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- 2019
14. Versatile and scalable pulse compression platform
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Foued Amrani, Chakradhar Sahoo, Julien Madéo, Benoit Debord, Keshav M. Dani, Benoit Beaudou, Martin Maurel, Fetah Benabid, Matthieu Chafer, Frédéric Gérôme, Gerome, Frédéric, GLOphotonics S.A.S., Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Femtosecond Spectroscopy Unit, Okinawa Institute of Science and Technology Graduate University (OIST), and OSA
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Materials science ,[SPI.OPTI] Engineering Sciences [physics]/Optics / Photonic ,business.industry ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,law.invention ,Pulse (physics) ,010309 optics ,Nonlinear system ,13. Climate action ,law ,Pulse compression ,0103 physical sciences ,Scalability ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Optoelectronics ,0210 nano-technology ,business ,Gas compressor - Abstract
International audience; We report on a user-friendly sub-100 fs nonlinear pulse compression platform named FastLas. The compressor is based on gas fillable inhibited-coupling fibers and can be scaled over a large parameter-space of the input pulse. OCIS codes: 320.5520, 320.7140, 060.5295 1. Introduction Over the last two decades, ultra-short pulse (USP) lasers have witnessed a dramatic progress in their design, performance and in their applications. Nowadays, commercially available table-top lasers emitting pulses with duration of hundreds of femtosecond and milli-Joule energy have become a common place. Among the most representative of these USP lasers, we count Ti:Sapph laser emitting at around 800 nm for, Yb-based laser emitting around 1 µm, and Er-based laser emitting around 1.5 µm, and their frequency-doubled and tripled versions. Within this landscape, the laser pulse-duration is often larger than 100 fs, and achieving sub-100 fs pulse duration still remains a challenge. Among the limiting factors in pulse compression is the narrow gain-bandwidth of some lasers (e.g. Yb-based and Er-based lasers), which requires further spectral-broadening followed with a post-compression, and/or nonlinear compression. Furthermore, even with larger gain bandwidth lasers such as Ti:Sapph, complex setup are required for efficient dispersion compensation. Finally, the high sensitivity of current pulse-compression schemes to well defined parameter set of the input laser such as pulse energy, pulse duration, and wavelength, makes it extremely challenging to have efficient and scalable USP compressors. This situation is illustrated by state-of-the-art of Yb-based lasers. The latter offers a superior power-scaling, it can be operated in different operational modes, such as emitting from CW regime to 100 fs pulses with repetition rate from kHz to GHz repetition rate. Achieving sub-100 fs remains a challenging task despite the implementation of ingenious schemes to overpass this limitation [1]. In turn, this limits their impact in some of the emerging industrial applications where processing of some materials such as dielectric or semiconductor require 10-100 µJ level pulses with pulse-width below 300 fs. Here, we exploit the engineerable dispersion, the broadband transmission and high energy handling of Inhibted-Coupling guiding hollow-core photonic crystal fiber (IC-HCPCF) to propose a USP compression platform coined FastLas, which operates on energy range between few microjoules to hundred microjoules and efficient for a wide variety of wavelengths.
- Published
- 2019
15. Contaminant-free end-capped and single-mode acetylene photonic microcell for sub-Doppler spectroscopy
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Fetah Benabid, Foued Amrani, Martin Maurel, Frédéric Gérôme, Matthieu Chafer, Benoit Debord, Thomas Billotte, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), and GLOphotonics S.A.S.
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Materials science ,business.industry ,Buffer gas ,Single-mode optical fiber ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Laser ,7. Clean energy ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,law.invention ,010309 optics ,Laser linewidth ,Optics ,law ,0103 physical sciences ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Microcell ,Insertion loss ,0210 nano-technology ,Absorption (electromagnetic radiation) ,business ,Photonic-crystal fiber - Abstract
We report on the development of an acetylene-filled photonic microcell based on an assembly process that is contaminant free and requires no helium buffer gas nor gluing procedure. The microcell consists of a 7-m-long and 30 µm core-diameter inhibited-coupling guiding hollow-core photonic crystal fiber filled with acetylene gas at a pressure in the range of 80 µbar, sealed by capping its ends with fusion-collapsing a glass-tube sleeve, and mounted on FC connectors for integration. The microcell shows a robust single-mode behavior and a total insertion loss of ∼ 1.5 d B . The spectroscopic merit of the formed microcell is tested by generating electromagnetic induced transparency and saturated absorption on R13 and P9 absorption lines, respectively. The sub-Doppler transparencies show a close to transit time limited linewidth of 17 ± 3 M H z . The latter was monitored for over 3 months. As a demonstration, the microcell was used to frequency stabilize a laser with fractional frequency instability improvement by a factor 50 at 100 s integration time compared to free running laser operation.
- Published
- 2021
16. Optimized inhibited-coupling Kagome fibers at Yb-Nd:Yag (8.5 dB/km) and Ti:Sa (30 dB/km) ranges
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Benoit Debord, A. Amsanpally, Foued Amrani, Muhammad Adnan, Martin Maurel, Frédéric Gérôme, Matthieu Chafer, Fetah Benabid, and Luca Vincetti
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Materials science ,Optics, Optical Fibers, Hollow core fibers ,business.industry ,Transmission loss ,Bandwidth (signal processing) ,02 engineering and technology ,Hypocycloid ,Laser ,Atomic and Molecular Physics, and Optics ,law.invention ,Laser guidance ,Wavelength ,020210 optoelectronics & photonics ,Optics ,law ,0202 electrical engineering, electronic engineering, information engineering ,business ,Scaling ,Photonic-crystal fiber - Abstract
We report on the development of hypocycloid core-contour inhibited-coupling (IC) Kagome hollow-core photonic crystal fibers (HC-PCFs) with record transmission loss and spectral coverage that include the common industrial laser wavelengths. Using the scaling of the confinement loss with the core-contour negative curvature and the silica strut thickness, we fabricated an IC Kagome HC-PCF for Yb and Nd:Yag laser guidance with record loss level of 8.5 dB/km associated with a 225-nm-wide 3-dB bandwidth. A second HC-PCF is fabricated with reduced silica strut thickness while keeping the hypocycloid core contour. It exhibits a fundamental transmission window spanning down to the Ti:Sa spectral range and a loss figure of 30 dB/km at 750 nm. The fibers’ modal properties and bending sensitivity show these HC-PCFs to be ideal for ultralow-loss, flexible, and robust laser beam delivery.
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- 2018
17. Inhibited-coupling HC-PCF based beam-delivery-system for high power green industrial lasers
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Q. Lekiefs, Frédéric Gérôme, Fetah Benabid, Benoît Beaudou, Martin Maurel, A. Gorse, Matthieu Chafer, and Benoit Debord
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Materials science ,Beam delivery ,law ,business.industry ,Short pulse laser ,Optoelectronics ,Transmission coefficient ,Laser ,business ,Photonic-crystal fiber ,law.invention - Abstract
We report on an ultra-low loss Hollow-Core Photonic Crystal Fiber (HC-PCF) beam delivery system (GLO-GreenBDS) for high power ultra-short pulse lasers operating in the green spectral range (including 515 nm and 532 nm). The GLOBDS- Green combines ease-of-use, high laser-coupling efficiency, robustness and industrial compatible cabling. It comprises a pre-aligned laser-injection head, a sheath-cable protected HC-PCF and a modular fiber-output head. It enables fiber-core gas loading and evacuation in a hermetic fashion. A 5 m long GLO-BDS were demonstrated for a green short pulse laser with a transmission coefficient larger than 80%, and a laser output profile close to single-mode (M2
- Published
- 2018
18. 2-µm wavelength-range low-loss inhibited-coupling hollow-core PCF
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Foued Amrani, Fetah Benabid, Martin Maurel, Frederic Delahaye, Benoit Debord, Matthieu Chafer, and Frederic Gerome
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Detection limit ,Hollow core ,Materials science ,Fabrication ,business.industry ,Wavelength range ,Optoelectronics ,business ,Cladding (fiber optics) ,Photonic-crystal fiber ,Pulsed laser deposition - Abstract
We report on the design and fabrication of inhibited-coupling guiding hollow-core photonic crystal fiber with a transmission band optimized for low loss guidance around 2 μm. Two fibers design based on a Kagome-lattice cladding have been studied to demonstrate a minimum loss figure of 25 dB/km at 2 μm associated to an ultra-broad transmission band spanning from the visible to our detection limit of 3.4 μm. Such fibers could be an excellent tool to deliver and compress ultra-short pulse laser systems, especially for the emerging 2-3 μm spectral region.
- Published
- 2018
19. Pulse-compression down to 50 fs of femtosecond UV laser using Inhibited-Coupling hollow-core PCF
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Benoit Debord, Clemens Hönninger, Frédéric Gérôme, Foued Amrani, Martin Maurel, Eric Mottay, Matthieu Chafer, and Fetah Benabid
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Hollow core ,Coupling (electronics) ,Materials science ,Pulse compression ,business.industry ,Fiber laser ,Femtosecond ,Dispersion (optics) ,Uv laser ,Optoelectronics ,business ,Photonic-crystal fiber - Abstract
250 fs and several μΐ UV laser-pulses at 343 nm were spectrally broadened 20-fold and compressed down to 50 fs using gas-filled Inhibited-Coupling hollow-core photonic crystal fiber with optimized dispersion and Kerr optical nonlinearity.
- Published
- 2018
20. 2-3 µm wavelength-range low-loss inhibited-coupling hollow-core fiber
- Author
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Frederic Delahaye, Foued Amrani, Martin Maurel, Fetah Benabid, Benoit Debord, and Frédéric Gérôme
- Subjects
Hollow core ,Coupling (electronics) ,Range (particle radiation) ,Materials science ,Wavelength range ,Beam delivery ,business.industry ,Fiber laser ,Optoelectronics ,Fiber ,business ,Laser beams - Abstract
We report on ultra-broad transmission guiding large-mode area inhibited-coupling HC-PCFs. The fibers guidance spans from 500 nm to 3300 nm and exhibits losses in the range of 25-50 dB/km in the 2-3 μm wavelength range.
- Published
- 2018
21. La corona partida
- Author
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Martín Maurel and Martín Maurel
- Abstract
Tras el éxito de las novelas Isabel y Carlos, Rey Emperador, la serie se completa con La corona partida, situada cronológicamente entre ambas, que narra los hechos acontecidos tras la muerte de Isabel la Católica y las luchas de poder entre Fernando de Aragón y Felipe el Hermoso. 26 de noviembre de 1504. Isabel, soberana de Castilla, de León y de Granada, muere en Medina del Campo dejando viudo a su poderoso marido, Fernando de Aragón. En su testamento, Isabel nombra heredera a su hija Juana, casada con el archiduque Felipe de Habsburgo, y a quienes muchos consideran loca a causa de la pasión enfermiza que siente por su esposo. Juana nunca ha deseado la corona y desdeña el poder. Sin embargo, consciente de su responsabilidad ante la Historia, hará todo cuanto esté en su mano para cumplir la última voluntad de la reina Católica. Para ello tendrá que enfrentarse a dos hombres implacables: su esposo Felipe y su padre, el rey Fernando, quienes ansían gobernar Castilla sin contar con la legítima heredera. La joven reina Juana se verá atrapada en una red de intrigas y traiciones. Un juego peligroso en pos del poder que involucra a nobles, cardenales, reyes e incluso al propio emperador germánico, y que amenaza con convertir el legado de Isabel la Católica, su madre, en una corona partida.
- Published
- 2018
22. Experimental optimization of curvature and silica thickness core contour of inhibited-coupling Kagome fibers
- Author
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J.-M. Blondy, Muhammad Adnan, Frédéric Gérôme, Fetah Benabid, Luca Vincetti, A. Gorse, Martin Maurel, Benoit Debord, A. Amsanpally, Benoit Beaudou, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), GLOphotonics S.A.S., Department of Information Engineering [Modena], and Università degli Studi di Modena e Reggio Emilia (UNIMORE)
- Subjects
optical fibers ,Materials science ,Optical fiber ,02 engineering and technology ,hollow core fibers ,laser beams ,Curvature ,01 natural sciences ,7. Clean energy ,law.invention ,010309 optics ,Optics ,law ,Fiber laser ,0103 physical sciences ,ComputingMilieux_MISCELLANEOUS ,Coupling ,business.industry ,Attenuation ,Bandwidth (signal processing) ,021001 nanoscience & nanotechnology ,Femtosecond ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,0210 nano-technology ,business ,Photonic-crystal fiber - Abstract
The dramatic progress in power-scaling of ultra-short pulse (USP) lasers and their continuous expansion use in industrial applications call for flexible and robust beam delivery systems (BDS) over several meters. Recently, a new branch of hollow-core photonic crystal fiber (HC-PCF) based on inhibited coupling (IC) mechanism has been proposed and successfully applied to demonstrate the delivery of milliJoule 600 femtosecond pulses in a several meter long piece and in robustly single-mode fashion [1]. Despite this breakthrough, it is desirable to reduce further the attenuation and enlarge the operating bandwidth of such fiber to increase the capability of the BDS whilst keeping the same delivery performances. In this context, a carefully optimization of the geometrical parameters of the core contour (i.e., the curvature b [2] and the silica thickness t) is studied resulting in the fabrication of new state-of-the-art IC Kagome HC-PCF combining losses less than 10 dB/km for the first time and associated to an enlarged transmission bandwidth able to cover all the entire industrial spectral range.
- Published
- 2017
23. Giant compression of high energy optical pulses using a commercially available Kagome fiber
- Author
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Fetah Benabid, Antoine Dubrouil, Martin Maurel, Benoit Debord, Anton Husakou, Frédéric Gérôme, GLOphotonics S.A.S., Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Lasers Intenses et Applications (CELIA), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Bordeaux (UB), Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (MBI), Forschungsverbund Berlin e.V. (FVB) (FVB)-Leibniz Gemeinschaft, OSA, and Université de Bordeaux (UB)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Optical fiber ,Materials science ,business.industry ,Single-mode optical fiber ,Physics::Optics ,Polarization-maintaining optical fiber ,01 natural sciences ,Graded-index fiber ,law.invention ,010309 optics ,Optics ,law ,Fiber laser ,0103 physical sciences ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Dispersion-shifted fiber ,010306 general physics ,Plastic optical fiber ,business ,ComputingMilieux_MISCELLANEOUS ,Photonic-crystal fiber - Abstract
Recent results in laser beam delivery and ultra-short pulse (USP) compression using hypocycloid-core Kagome hollow-core photonic crystal fibers (HC-PCFs) [1] proved that this type of optical fiber is an excellent candidate as a photonic component for these applications. For example, it has been demonstrated that the fiber guides up to 1 mJ of600 fs long pulses with no damage, and by a simple choice of gas and fiber dispersion, the authors achieved both USP guidance with no pulse broadening nor narrowing, guidance with self-phase modulation (SPM) spectral broadening, and finally guidance with over 10-fold self-compression using solitonic dynamics. However, these compression results necessitated both fiber gas-loading-system and tailored fiber-fabrication, which are not necessarily accessible to the broader research community. Here, we report on a set of results of self-compression of a USP laser based on a commercially available Kagome fiber (PMC-C-YB-7C from GLOphotonics [2]) and with no need of gas loading management. The compression relies on pulse dynamics near the photoionization threshold, which shows a strong and abrupt self-compression via the formation of a soliton at a well-defined pulse energy value and then its breakup at higher energy values [3]. By simply adjusting the fiber length from 10 cm to 4 m, we achieved compression of an initial 600 fs from Yb-doped USP-laser down to ∼20 fs (a compression ratio ∼30) over an energy span of 10–500 μJ. Figure 1(a) shows a summary of calculated (dotted curves) and measured (solid curves) pulse duration evolution with input energy for different fiber lengths. All curves show a “step shape” corresponding to this sudden compression, and the input energy value at which the self-compression occurs increases with shortening fiber length. A typical experimental FROG [4] evolution of such dynamic is shown in Figure 1 (c) for the case of 2 m fiber length resulting in a spectral broadening, a soliton red-shift and a strong pulse compression as the energy is increased. For this conditions, the maximum compression occurs at an energy around 60 μΐ. For higher energy, the pulse breaks up via soliton fission.
- Published
- 2017
24. Ultra-low loss (8.5 dB/km @ Yb-laser wavelength range) inhibited-coupling Kagome HC-PCF for laser beam delivery applications
- Author
-
M. Adnan, Benoit Debord, Martin Maurel, Jean-Marc Blondy, Benoit Beaudou, A. Amsanpally, Frédéric Gérôme, Fetah Benabid, and Luca Vincetti
- Subjects
Ytterbium ,Materials science ,business.industry ,Wavelength range ,Attenuation ,Bandwidth (signal processing) ,chemistry.chemical_element ,02 engineering and technology ,Laser ,01 natural sciences ,law.invention ,010309 optics ,020210 optoelectronics & photonics ,Optics ,Beam delivery systems ,Hollow-core photonic crystal fiber ,Ultra-short pulse laser ,Electronic, Optical and Magnetic Materials ,Condensed Matter Physics ,Computer Science Applications1707 Computer Vision and Pattern Recognition ,Applied Mathematics ,Electrical and Electronic Engineering ,chemistry ,law ,Beam delivery ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,business ,Laser beams ,Photonic-crystal fiber - Abstract
The dramatic progress in power-scaling of ultra-short pulse (USP) lasers and their growing use in industrial applications call for flexible and robust beam delivery systems (BDS) over several meters with no temporal or modal distortions. Inhibited coupling (IC) hypocycloid Kagome hollow-core photonic crystal fiber (HC-PCF) has recently proved to be an excellent solution for guiding these USP. In order to reduce further the attenuation of such fiber and then to increase the BDS capabilities, we report on an optimized IC Kagome HC-PCF exhibiting record loss level (8.5dB/km at 1030nm) associated with a 225nm wide 3-dB bandwidth and low bend sensitivity.
- Published
- 2017
25. Strong nonlinear optical effects in micro-confined atmospheric air
- Author
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Fetah Benabid, Luca Vincetti, Benoit Debord, Martin Maurel, Frédéric Gérôme, Anton Husakou, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), Department of Information Engineering [Modena], Università degli Studi di Modena e Reggio Emilia (UNIMORE), Max-Born-institut, and Max-Born-institut, Berlin
- Subjects
Materials science ,hollow core fibers, nonlinear optics, photonics crystal fiber ,business.industry ,Physics::Optics ,Nonlinear optics ,Optical power ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Laser ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Supercontinuum ,law.invention ,010309 optics ,law ,Nonlinear medium ,0103 physical sciences ,Dispersion (optics) ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Optoelectronics ,High harmonic generation ,0210 nano-technology ,business ,Photonic-crystal fiber - Abstract
International audience; Historically, nonlinear optical phenomena such as spectral broadening by harmonic generation have been associated with crystals owing to their strong nonlinear refractive indices, which are in the range of ∼10 −14 cm 2 ∕W. This association was also the result of the limited optical power available from early lasers and the limited interaction length that the laser-crystal interaction architecture could offer. Consequently, these limitations disqualified a large number of materials whose nonlinear coefficient is lower than n 2 ∼10 −16 cm 2 ∕W as suitable materials for nonlinear optics applications. For example, it is a common practice in most of optical laboratories to consider ambient or atmospheric air as a "nonlinear optically" inert medium due to its very low nonlinear coefficient (∼10.10 −19 cm 2 ∕W) and low density. Today, the wide spread of high-power ultra-short pulse lasers on one hand, and low transmission loss and high-power handling of Kagome hollow-core photonic crystal fiber on the other hand, provide the necessary ingredients to excite strong nonlinear optical effects in practically any gas media, regardless of how low its optical nonlinear response is. By using a single table-top 1 mJ ultra-short pulse laser and an air exposed inhibited-coupling guiding hollow-core photonic crystal fiber, we observed generation of supercontinuum and third harmonic generation when the laser pulse duration was set at 600 fs and Raman comb generation when the duration was 300 ps. The supercontinuum spectrum spans over ∼1000 THz and exhibits a typical spectral-density energy of 150 nJ/nm. The dispersion profile of inhibited-coupling hollow-core fiber imprints a distinctive sequence in the supercontinuum generation, which is triggered by the generation of a cascade of four-wave mixing lines and concluded by solitonic dynamics. The Raman comb spans over 300 THz and exhibits multiple sidebands originating from N 2 vibrational and ro-vibrational Raman transitions. With the growing use of hollow-core photonic crystal fiber in different fields, the results can be applied to mitigate air nonlinear response when it is not desired or to use ambient air as a convenient nonlinear medium.
- Published
- 2019
26. Isabel, el fin de un sueño : Todos conocen a la reina, pero ninguno a Isabel
- Author
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Martín Maurel and Martín Maurel
- Abstract
La novela de la tercera temporada de la serie de éxito de TelevisiónEspañolaIsabel: la llegada de Colón a América, la conquista deNápoles y la cristianización de Granada. Han sido años convulsos, una época apasionante en la vida de los Reyes Católicos, rica en acontecimientos que tendrán importantes consecuencias en la futura creación de lo que hoy conocemos como España, pero también llena de momentos clave que han hecho mella en la relación entre Isabel y Fernando. El descubrimiento de América en 1942 convierte a Castilla en una gran potencia mundial gracias al monopolio comercial establecido con el recién descubierto continente. También ha culminado la Reconquista con la anexión de Granada y, junto a la aventura colombina, parece que se ha alcanzado una meta. Sin embargo, desde el inicio, Isabel y Fernando perciben cruelmente la fragilidad de todo lo conseguido. Los monarcas pronto se enfrentarán a una sucesión de desgracias personales que habrán de superar como reyes y como padres, sin perder nunca de vista su principal objetivo: unificar las coronas de Castilla y Aragón a través de un heredero legítimo. Isabel narra las pasiones, emociones y renuncias de una mujeradelantada a su tiempo, que decidió ser dueña de su propiodestino y rechazó serfigura decorativa y moneda de cambio. Una mujer,con sus virtudes y defectos, que alcanzó un poder hastaentonces reservado a los hombres y que no tardaría en afrontarretos que nadie podía imaginar.
- Published
- 2014
27. Isabel, la conquista del poder : Todos conocen a la reina, pero ninguno a Isabel
- Author
-
Martín Maurel and Martín Maurel
- Subjects
- Historical fiction
- Abstract
La novela de la segunda temporada de la serie de éxito de Televisión Española Isabel: la victoria contra Portugal, la toma de Granada, la expulsión de los judíos y la llegada de Colón a la corte. Después de superar los complots, las venganzas y las traiciones que la han rodeado desde su nacimiento, Isabel se ha erigido reina de Castilla. Ahora comienza una nueva etapa: el reinado de Isabel y Fernando, y se proponen unificar, cristianizar y pacificar una Castilla convulsa y dividida. Durante este período también se construye el mito de un matrimonio, conocido como Los Reyes Católicos. Tras esa pareja subyacen las tensiones de una relación de nuestro tiempo. Mientras que Fernando ejerce de antagonista de Isabel, ella se enfrenta a sí misma, siempre fiel a su esposo y a Dios. Isabel narra las pasiones, emociones y renuncias de una mujer adelantada a su tiempo, que decidió ser dueña de su propio destino y rechazó convertirse en moneda de cambio. Una mujer, con sus virtudes y defectos, que alcanzó un poder hasta entonces reservado a los hombres y que no tardaría en afrontar retos que nadie podía imaginar.
- Published
- 2013
28. Fabrication and characterization of Iodine Vapor Photonic Microcell
- Author
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Frédéric Gérôme, Martin Maurel, Benoit Debord, C. Goicoechea, Philippe Thomas, Thomas Billotte, Matthieu Chafer, Jenny Jouin, Fetah Benabid, Photonique Fibre et Sources Cohérentes (XLIM-PHOT), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), GLOphotonics S.A.S., IRCER - Axe 3 : organisation structurale multiéchelle des matériaux (IRCER-AXE3), Institut de Recherche sur les CERamiques (IRCER), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Gerome, Frédéric
- Subjects
Fabrication ,Materials science ,[SPI.OPTI] Engineering Sciences [physics]/Optics / Photonic ,business.industry ,chemistry.chemical_element ,Iodine ,01 natural sciences ,3. Good health ,Characterization (materials science) ,010309 optics ,chemistry ,0103 physical sciences ,[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic ,Microcell ,Optoelectronics ,Fiber ,Photonics ,010306 general physics ,business ,Absorption (electromagnetic radiation) ,Photonic-crystal fiber - Abstract
International audience; A standalone FC/PC connectorized and sealed Iodine filled hollow core fiber with coupling efficiency as high as 75% and an absorption contrast reaching 65% on the P(33) 6-3 transition at room temperature is demonstrated.
29. Ultralow transmission loss in inhibited-coupling guiding hollow fibers
- Author
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A. Amsanpally, Fetah Benabid, J.-M. Blondy, Luca Vincetti, Martin Maurel, Assaad Baz, Florent Scol, Frédéric Gérôme, Emmanuel Hugonnot, Matthieu Chafer, and Benoit Debord
- Subjects
All-silica fiber ,Materials science ,business.industry ,Plastic-clad silica fiber ,Transmission loss ,02 engineering and technology ,Microstructured optical fiber ,Fiber design and fabrication ,Photonic crystal fibers ,Fiber characterization ,021001 nanoscience & nanotechnology ,Cladding (fiber optics) ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,010309 optics ,0103 physical sciences ,Optoelectronics ,0210 nano-technology ,business ,Plastic optical fiber ,Hard-clad silica optical fiber ,Photonic-crystal fiber - Abstract
Attenuation in photonic bandgap guiding hollow-core photonic crystal fiber (HC-PCF) has not beaten the fundamental silica Rayleigh scattering limit (SRSL) of conventional step-index fibers due to strong core-cladding optical overlap, surface roughness at the silica cladding struts, and the presence of interface modes. Hope has been revived recently by the introduction of hypocycloid core contour (i.e., negative curvature) in inhibited-coupling guiding HC-PCF. We report on several fibers with a hypocycloid core contour and a cladding structure made of a single ring from a tubular amorphous lattice, including one with a record transmission loss of 7.7 dB/km at ∼750 nm (only a factor ∼2 above the SRSL) and a second with an ultrabroad fundamental band with loss in the range of 10–20 dB/km, spanning from 600 to 1200 nm. The reduction in confinement loss makes these fibers serious contenders for light transmission below the SRSL in the UV–VIS–NIR spectral range and could find application in high-energy pulse laser beam delivery or gas-based coherent and nonlinear optics.
- Full Text
- View/download PDF
30. Les holdings : la holding : outil de transition efficace pour passer d'un patrimoine professionnel à un patrimoine privé
- Author
-
Tagnard, Pierre, Université Grenoble Alpes - Institut d'Administration des Entreprises (UGA IAE), Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Banque Martin Maurel, 24 boulevard Édouard Rey, 38000 Grenoble, and Érick Benillouche
- Subjects
Levier fiscal ,Contrat de capitalisation ,Régime mère-fille ,Régime de l’intégration fiscale ,Holding ,Fonds dédiés ,Emprunt ,Dividendes ,Cession ,Actifs immobiliers ,Portefeuille titres ,Levier juridique ,Levier financier ,Biens professionnels ,ISF ,Démembrement ,Pacte Dutreil ,Transmission ,[SHS.GESTION]Humanities and Social Sciences/Business administration ,Plus-values ,Holding animatrice ,Actifs financiers - Abstract
Le mode de détention des biens professionnels est une problématique actuelle pour les chefs d’entreprises français. La holding apparaît comme un outil intéressant sur le plan fiscal, juridique, comptable et patrimonial. Le thème des holdings étant très vaste, ce mémoire n’a pas vocation à aborder toutes les notions les concernant. Nous verrons en quoi une société holding peut être considérée comme un outil de transition efficace pour passer d’un patrimoine professionnel à un patrimoine privé. Ce travail pourra alors servir de conseil à des chefs d’entreprises s’interrogeant sur les avantages que présente la holding dans le rachat et l’exploitation d’une société cible ainsi que sur l’impact que pourrait avoir une cession ou une transmission de cette même société. Les aspects abordés correspondront donc à deux phases importantes de la vie du chef d’entreprise, à savoir la naissance de son projet professionnel et l’optimisation de son départ en retraite.
- Published
- 2014
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