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Your search keyword '"B. Prade"' showing total 17 results
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17 results on '"B. Prade"'

1. Transfer of microwave energy along a filament plasma column in air

Author

Michel Pellet, B. Prade, Jean Larour, Aurélien Houard, André Mysyrowicz, Interaction Laser-Matière (ILM), Laboratoire d'optique appliquée (LOA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Plasmas (LPP), Université Paris-Sud - Paris 11 (UP11)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École polytechnique (X)-Sorbonne Université (SU)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Ministère de la défense, DGA, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École polytechnique (X)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics and Astronomy (miscellaneous), microwave, General Physics and Astronomy, 02 engineering and technology, 01 natural sciences, ultrashort laser, Two-stream instability, Filamentation, Physics::Plasma Physics, 0103 physical sciences, 010306 general physics, plasma, Physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Dense plasma focus, Waves in plasmas, nonlinear optics, General Engineering, Plasma, 021001 nanoscience & nanotechnology, filamentation, Physics::Space Physics, Electromagnetic electron wave, Plasma channel, Inductively coupled plasma, Atomic physics, 0210 nano-technology
Abstract

International audience; We demonstrate the coupling of microwave radiation into a plasma channel formed by laser filamentation in air, leading to the amplification by two orders of magnitude of longitudinal oscillations of the plasma. Transfer of this longitudinal excitation towards unexcited region of the plasma column occurs over more than 10 cm, in good agreement with a theoretical model describing the propagation of a TM wave guided along the surface between air and plasma. We foresee that high power low frequency electromagnetic waves injected into a multi-filament plasma could initiate and sustain a long-lived plasma over several meters distance.

Published
2017
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2. Numerical simulations of the nonlinear propagation of femtosecond optical pulses in gases

Author

Michel Franco, J.-F. Ripoche, André Mysyrowicz, B. Lamouroux, Gilles Riazuelo, A. Chiron, Guy Bonnaud, Rüdiger Lange, B. Prade, Dipartimento di Fisica, University of Pisa - Università di Pisa, Laboratoire d'optique appliquée (LOA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Théorique et Appliquée (DPTA), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction des Applications Militaires (DAM), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
Physics, Diffraction, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Kerr effect, Wave propagation, business.industry, nonlinear optics, Optical physics, Physics::Optics, Nonlinear optics, Laser, PACS: 42.62.Tg, 42.65.-k, 52.35.Mw, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, filamentation, 010309 optics, Optics, law, 0103 physical sciences, Femtosecond, 010306 general physics, business, Ultrashort pulse
Abstract

International audience; A two-dimensional axisymmetric model of the propagation of intense femtosecond laser pulses through dispersion-free transparent media is described. The effects of diffraction, nonlinear Kerr effect (instantaneous and retarded) and multiphoton ionisation are included. Numerical results concerning air and other gases are discussed. In particular, time self-compression of femtosecond pulses is predicted. Stable self-guided pulses are simulated, in agreement with recent experimental observations.

Published
1999
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3. Spatial mode cleaning by femtosecond filamentation in air

Author

Olivier Vasseur, M. Krenz, D. Seiffer, Michel Franco, B. Prade, André Mysyrowicz, B. Eberle, Arnaud Couairon, H. Buersing, Laboratoire d'optique appliquée (LOA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique Théorique [Palaiseau] (CPHT), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X), Research Institute for Optronics and Pattern Recognition (FOM), Research Institute for Optronics and Pattern Recognition, ONERA - The French Aerospace Lab [Palaiseau], ONERA-Université Paris Saclay (COmUE), and Publica

Subjects
Femtosecond pulse shaping, Physics::Optics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, OCIS codes: 010.1300, 190.5940, 190.7110, law.invention, 010309 optics, Protein filament, Optics, Filamentation, law, 0103 physical sciences, Physics::Atomic Physics, 010306 general physics, Self-phase modulation, Astrophysics::Galaxy Astrophysics, Physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Nonlinear optics, Laser, Atomic and Molecular Physics, and Optics, Pulse (physics), filamentation, Femtosecond, Nonlinear Optics, business
Abstract

International audience; By studying the conical emission of a blue femtosecond laser filament in air, it is shown that self-improvement of the beams' spatial mode quality occurs for a self-guided laser pulse.

Published
2006
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4. Amplification of femtosecond filaments

Author

Arnaud Couairon, A. Jullien, J. Philip, B. Prade, André Mysyrowicz, Gilles Chériaux, Michel Franco, and C. D'Amico

Subjects
Femtosecond pulse shaping, Materials science, genetic structures, Subthreshold conduction, business.industry, Nonlinear optics, macromolecular substances, Molecular physics, Optical parametric amplifier, Quantitative Biology::Cell Behavior, Quantitative Biology::Subcellular Processes, Filamentation, Femtosecond, Sapphire, Optoelectronics, business, Ultrashort pulse
Abstract

We study the formation of femtosecond filaments in an amplifying medium (Ti:Sa). Subthreshold onset of filamentation as well as flux amplification without fragmentation is observed, in good agreement with simulations.

Published
2005
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5. Propagation of fs TW laser filaments in adverse atmospheric conditions

Author

Philipp Rohwetter, Jérôme Kasparian, G. Méjean, W. Winn, Jean-Pierre Wolf, Roland Sauerbrey, Ludger Wöste, Jin Yu, L. A. (Vern) Schlie, André Mysyrowicz, R. Ackermann, B. Prade, Kamil Stelmaszczyk, E. Salmon, G. Méchain, Yves-Bernard André, Laboratoire d'optique appliquée (LOA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Spectrométrie Ionique et Moléculaire (LASIM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Institut für Experimentalphysik, Freie Universität Berlin, Langmuir Laboratory for Atmospheric Research, New Mexico Institute of Mining and Technology [New Mexico Tech] (NMT), Directed Energy Directorate (AFRL/DELS), Air Force Research Laboratory (AFRL), Institut fur Optik und Quantenelectronik (IOQ), Friedrich-Schiller-Universität = Friedrich Schiller University Jena [Jena, Germany], and Teramobile

Subjects
PACS: 42.65.Jx, 42.68.Ge, 42.68.-w, [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, Nonlinear optics, macromolecular substances, Laser, 01 natural sciences, law.invention, 010309 optics, Protein filament, filamentation, Optics, Filamentation, law, 0103 physical sciences, Femtosecond, Drizzle, 010306 general physics, business, Ultrashort pulse, Refractive index
Abstract

International audience; The propagation of femtosecond terawatt laser pulses at reduced pressure (0.7 atm) is investigated experimentally. In such conditions, the non-linear refractive index n 2 is reduced by 30%, resulting in a slightly farther filamentation onset and a reduction of the filament number. However, the filamentation process, especially the filament length, is not qualitatively affected. We also show that drizzle does not prevent the filaments from forming and propagating.

Published
2005
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6. Femtosecond filamentation in air at low pressures

Author

André Mysyrowicz, B. Prade, Michel Franco, Arnaud Couairon, Thomas Olivier, and G. Méchain

Subjects
Physics, Pressure range, Optics, genetic structures, Filamentation, Atmospheric pressure, Computer simulation, business.industry, Numerical analysis, Femtosecond, Nonlinear optics, Plasma, business
Abstract

We investigate the influence of air pressure on femtosecond filamentation in the laboratory, in the pressure range between 0.2 and 1 bar. Numerical simulations reproduce the main features of the experimental results.

Published
2005
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7. Long range filamentary propagation in air

Author

A. Mysyrowicz, A. Couairon, G. Méchain, M. Franco, and B. Prade

Subjects
Physics, Femtosecond pulse shaping, Range (particle radiation), Amplitude, Optics, Computer simulation, Filamentation, business.industry, Phase (waves), Nonlinear optics, Pulsed power, business
Abstract

We have studied long distance filamentation in air at high pulse power. Multi-filamentary patterns can be controlled by phase or amplitude masks. Results are in good agreement with numerical simulations from a 3-d propagation code.

Published
2004
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8. Anomalous long-range propagation of femtosecond laser pulses through air: moving focus or pulse self-guiding?

Author

B. Lamouroux, André Mysyrowicz, G. Grillon, H. R. Lange, J.-F. Ripoche, Michel Franco, B. Prade, A. Chiron, Erik T. J. Nibbering, Laboratoire d'optique appliquée (LOA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (MBI), Dipartimento di Fisica, and University of Pisa - Università di Pisa

Subjects
Physics, Femtosecond pulse shaping, Focal point, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, nonlinear optics, Physics::Optics, Laser, ocis: 190.0190, 190.3270, 190.5530, 190.7110, 01 natural sciences, Atomic and Molecular Physics, and Optics, law.invention, Pulse (physics), 010309 optics, filamentation, Optics, Multiphoton intrapulse interference phase scan, law, 0103 physical sciences, Femtosecond, Filament propagation, kerr effect, 010306 general physics, business, Ultrashort pulse
Abstract

International audience; Self-guided propagation of femtosecond laser pulses is studied for a converging-beam configuration. Channeling of the pulse energy through various gases is observed over distances well beyond the lens focal point, a fact that cannot be explained by the moving-focus model. The results are in good agreement with three-dimensional numerical simulations.

Published
1998
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9. Characterization of ultra-short pulses by cross-phase modulation

Author

André Mysyrowicz, H. R. Lange, B. Prade, Michel Franco, J.-F. Ripoche, Laboratoire d'optique appliquée (LOA), and École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Iterative method, Phase (waves), 02 engineering and technology, 01 natural sciences, law.invention, 010309 optics, 020210 optoelectronics & photonics, Optics, law, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Optical autocorrelation, Cross-phase modulation, nonlinear optics, ultrashort pulses, Laser, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Intensity (physics), Pulse (physics), business, Phase retrieval
Abstract

International audience; We present an improved iterative algorithm which allows to reconstruct the temporal pulse profile, phase and absolute intensity of ultra-short laser pulses from a set of cross-phase-modulated spectra. The changes in the centre of gravity of the recorded spectra allow to reconstruct the intensity autocorrelation independently of the phase retrieval algorithm. Ambiguity problems encountered in a previous scheme are eliminated.

Published
1997
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10. Determination of the time dependence of n2 in air

Author

B. Prade, J.-F. Ripoche, Rüdiger Lange, Michel Franco, G. Grillon, Erik T. J. Nibbering, André Mysyrowicz, Laboratoire d'optique appliquée (LOA), and École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, nonlinear optics, 01 natural sciences, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, 010309 optics, Optics, Modulation, 0103 physical sciences, kerr effect, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, 010306 general physics, business
Abstract

International audience; Using cross-phase modulation, the dynamics of the Kerr-like response of air is studied. Spontaneous resurgences of the induced non-linear polarisation are observed, in good agreement with a theoretical model.

Published
1997
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11. Spectral determination of the amplitude and the phase of intense ultrashort optical pulses

Author

Erik T. J. Nibbering, André Mysyrowicz, B. Prade, Jean-Paul Chambaret, Michel Franco, G. Grillon, Laboratoire d'optique appliquée (LOA), and École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, nonlinear optics, Phase (waves), Physics::Optics, Statistical and Nonlinear Physics, 02 engineering and technology, 01 natural sciences, Atomic and Molecular Physics, and Optics, Pulse (physics), 010309 optics, 020210 optoelectronics & photonics, Optics, Amplitude, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, High harmonic generation, Self-phase modulation, Phase retrieval, business, Phase modulation, Bandwidth-limited pulse
Abstract

International audience; We present the results of the spectral analysis of intense ultrashort laser pulses propagating through nonlinear transparent media. We discuss the spectral features characteristic of the self-phase-modulation process, which is the most prominent process during nonguided propagation in the weakly nonlinear regime. We describe an application of automatic pulse phase retrieval based on the Kerr-like nonlinearity.

Published
1996
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12. Measurement of the nonlinear refractive index of transparent materials by spectral analysis after nonlinear propagation

Author

C. Le Blanc, Erik T. J. Nibbering, B. Prade, Michel Franco, André Mysyrowicz, G. Grillon, Laboratoire d'optique appliquée (LOA), and École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Kerr effect, Materials science, Physics::Optics, 02 engineering and technology, 01 natural sciences, 010309 optics, Optics, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Z-scan technique, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Physics::Chemical Physics, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, nonlinear optics, Response time, Nonlinear optics, Nonlinear refractive index, 021001 nanoscience & nanotechnology, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Nonlinear system, Femtosecond, 0210 nano-technology, business, Refractive index
Abstract

International audience; A fast and accurate method for the measurement of the nonlinear refractive index of transparent materials is presented. The method is applied to various solids and liquids. The effective femtosecond response time of the optical Kerr effect in benzene and methanol is determined.

Published
1995
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13. Triggering, guiding and deviation of long air spark discharges with femtosecond laser filament

Author

Aurélien Houard, Yves-Bernard André, Jérôme Carbonnel, I. Revel, J. C. de Miscault, B. Esmiller, Amélie Jarnac, M. Le Nevé, Magali Durand, Benjamin Forestier, André Mysyrowicz, D. Chapuis, B. Prade, Laboratoire d'optique appliquée (LOA), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), EADS Innovation Works [Toulouse], EADS - European Aeronautic Defense and Space, ONERA - The French Aerospace Lab [Châtillon], ONERA-Université Paris Saclay (COmUE), Interaction Laser-Matière (ILM), École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Compagnie industrielle des lasers [Orléans] (CILAS), Compagnie industrielle des lasers (CILAS), and ASTRIUM

Subjects
genetic structures, General Physics and Astronomy, plasma light propagation, macromolecular substances, 02 engineering and technology, 01 natural sciences, law.invention, Protein filament, Optics, sparks, law, high-speed optical techniques, 0103 physical sciences, Spark (mathematics), plasma production by laser, 010306 general physics, Large distance, [PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], business.industry, Chemistry, nonlinear optics, Lightning rod, 021001 nanoscience & nanotechnology, Laser, lcsh:QC1-999, Femtosecond, Electrode, Optoelectronics, PACS: 52.80.Mg, 42.65.Jx, 52.38.Hb, 52.50.Jm, Electric discharge, 0210 nano-technology, business, lcsh:Physics
Abstract

International audience; In the perspective of the laser lightning rod, the ability of femtosecond filaments to trigger and to guide large scale discharges has been studied for several years. The present paper reports recent experimental results showing for the first time that filaments are able not only to trigger and guide but also to divert an electric discharge from its normal path. Laser filaments are also able to divert the spark without contact between laser and electrodes at large distance from the laser. A comparison between negative and positive discharge polarities also reveals important discrepancies in the guiding mechanism.

Published
2012
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14. Determination of the inertial contribution to the nonlinear refractive index of air, N_2, and O_2 by use of unfocused high-intensity femtosecond laser pulses

Author

B. Prade, Erik T. J. Nibbering, Michel Franco, André Mysyrowicz, G. Grillon, Laboratoire d'optique appliquée (LOA), and École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Materials science, Kerr effect, business.industry, nonlinear optics, Nonlinear optics, Statistical and Nonlinear Physics, Laser, 01 natural sciences, Atomic and Molecular Physics, and Optics, Spectral line, law.invention, 010309 optics, Optics, law, Electric field, 0103 physical sciences, Femtosecond, kerr effect, 010306 general physics, business, Refractive index, Excitation
Abstract

International audience; We analyze the spectral changes that occur when unfocused intense femtosecond pulses at 800 nm propagate through different atomic and molecular gases. The observed red shift in the self-phase-modulated spectra after propagation through N2, O2, and air is attributed to a delayed change of the nonlinear refractive index, a consequence of the molecular response to impulsive excitation of rotational coherences. We compare these results on the nonlinear refractive index with those obtained from Ar, Xe, and SF6.

Published
1997
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15. Conical emission from self-guided femtosecond pulses in air

Author

Erik T. J. Nibbering, François Salin, Michel Franco, G. Grillon, B. Prade, André Mysyrowicz, P. F. Curley, Laboratoire d'optique appliquée (LOA), and École Nationale Supérieure de Techniques Avancées (ENSTA Paris)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics], Total internal reflection, Materials science, business.industry, Astrophysics::High Energy Astrophysical Phenomena, nonlinear optics, Physics::Optics, Conical surface, Cladding (fiber optics), 01 natural sciences, Atomic and Molecular Physics, and Optics, filamentation, 010309 optics, Optics, 13. Climate action, Ionization, 0103 physical sciences, Femtosecond, kerr effect, 010306 general physics, business, Spectroscopy, Refractive index, Cherenkov radiation
Abstract

International audience; Conical emission in the forward direction is observed from intense femtosecond light pulses propagating through air over long distances. The conical emission is attributed to Čerenkov radiation from a dynamic self-guiding structure consisting of a weakly ionized core surrounded by Kerr cladding.

Published
1996
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16. Self-guided propagation of fs UV laser pulses and efficient harmonic generation in low pressure Argon

Author

Stylianos Tzortzakis, S. D. Moustaizis, N. Vakakis, Michel Franco, Nektarios A. Papadogiannis, André Mysyrowicz, N. Kortsalioudakis, Arnaud Couairon, B. Prade, and Michael Tatarakis

Subjects
Argon, Materials science, business.industry, chemistry.chemical_element, Nonlinear optics, Physics::Optics, Plasma, medicine.disease_cause, Laser, Laser pulses, Picosecond,Light pulses, Picosecond,Light pulses, Ultrashort,Picosecond laser pulses,Picosecond light pulses,Ultrashort laser pulses,Ultrashort light pulses,laser pulses ultrashort,laser pulses picosecond,light pulses picosecond,light pulses ultrashort,picosecond laser pulses,picosecond light pulses,ultrashort laser pulses,ultrashort light pulses, law.invention, Optics, chemistry, law, Harmonics, Femtosecond, medicine, Physics::Atomic and Molecular Clusters, High harmonic generation, Optoelectronics, business, Ultraviolet
Abstract

Summarization: An important enhancement in harmonics production has been observed during the self-guided propagation of femtosecond ultraviolet laser pulses (248nm, 450fs) in Argon, attributed to quasi-phase locking in the filamented pulse. Presented on

17. Long range horizontal propagation of femtosecond self-channelled laser pulses in air

Author

Yves-Bernard André, R. Sauerbrey, G. Mechain, Stylianos Tzortzakis, André Mysyrowicz, C. D'Amico, Arnaud Couairon, Michel Franco, E. Salmon, and B. Prade

Subjects
Femtosecond pulse shaping, Physics, business.industry, Nonlinear optics, macromolecular substances, Plasma, Laser, law.invention, Pulse (physics), Optics, Filamentation, law, Femtosecond, Chirp, business
Abstract

Using a multiterawatt femtosecond laser, we have studied long distance (~2 km) filamentation in air as a function of initial pulse chirp. Ionized channels are observed over several hundred meters

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