Dr. Stéphane Petit Profile

Dr. Stéphane Petit

at Ctr Lasers Intenses et Applications

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Publications (7)

Proceedings Article | 3 December 2022 Poster + Presentation

Laser induced damage of an amplifier medium immersed in a fluid

Laurent Lamaignère, Guilhem Rouzaud, Guillaume Duchateau, Philippe Balcou, Denis Marion, Christophe Feral, Stephane Petit, Dominique Descamps, Antoine Rohm, Marie Christine Nadeau, Eric Mevel, Jerome Lhermitte

Proceedings Volume PC12300, PC123000F (2022) https://doi.org/10.1117/12.2644511

KEYWORDS: Laser induced damage, Amplifiers, Laser applications, Cooling systems, Resistance, Picosecond phenomena, Liquids, Laser damage threshold, Laser crystals, Environmental sensing

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Proceedings Article | 29 May 2018 Presentation

Ultrafast dynamics of phase change material probed by frequency domain interferometry (Conference Presentation)

Jérôme Gaudin, Irene Papagiannouli, Valérie Blanchet, Dominique Descamps, Claude Fourment, Stephane Petit, Jea-Yves Raty, Nicolas Bernier, Pierre Noé, Jean-Baptiste Dory

Proceedings Volume 10673, 1067303 (2018) https://doi.org/10.1117/12.2314987

KEYWORDS: Ultrafast phenomena, Interferometry, Crystals, Refractive index, Phase shifts, Polarization, Thin films, Chalcogenides, Phase interferometry, Optical storage

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Chalcogenide Phase-Change Materials (PCMs), mainly GeSbTe-based alloys, have already been widely used for optical data storage in DVD-RAM or CD-RW. Thanks to their unique reversible and very fast amorphous to crystalline phase transition which is characterized by an uncommon huge change in optical and electrical properties, PCMs are now extensively studied aiming at developing innovative emerging non-volatile memories such as phase change random access memory (PCRAM) or storage class memories (SCM) in order to replace current dominant Flash memory technology [1]. The interaction of PCMs with a fs light pulse has attracted significant attention due to fundamental interest since the possible non-thermal amorphous↔crystal phase transition could be used as a process to drive the phase change above the thermal “speed limits” [2]. Our experiments address the investigation of ultra-fast phenomena of fundamentals laser-material interaction. Frequency domain interferometry (FDI) [3] is a pump-probe experiment that gives access to the variation of the refractive index of a material. A pump pulse (25 fs, 800 nm, 1kHz) is used to trigger a phase transition. The probe beam is made of two pulses (120 fs, 532 nm) delayed by 9 ps in our case which are focused on the pump/sample interaction point. The first probe pulse impinges the surface of the sample before the pump pulse, and is thus reflected on the unperturbed material, while the second one that arrives after the pump pulse, is reflected on the pump-heated material. Both pulses are then sent in a spectrometer where they interfere in the frequency domain. The intensity variation and phase shifts in the interference pattern (right image in the fig. 1) can be used to retrieve variations of the optical constant of the heated material. The interference pattern is simultaneously measured for the S ans P polarization independently. The samples are amorphous GeSbTe-based thin film deposited by magnetron sputtering in a 200 mm industrial deposition tool at in the LETI clean-rooms. A 10 nm thick SiN capping layer of hwas been coated deposited on top of the GST films in order to prevent surface oxidation. We will present the results obtained on prototypical PCMs thin films, i.e. Ge2Sb2Te5 and GeTe. Experiments have been conducted in the fluence range (from 17 to 31 mJ/cm2 ) allowing us to trigger the amorphous to crystal phase transition. Dynamics on the sub-ps time scale shows a very rapid switch mainly attributed to the real part of the refractive index. The polarisation resolved FDI permits to foster information on the behaviour of the surface. A clear phase shift is attributed to a contraction, in the nm range, and the sub-ps time scale. The results presented will be discussed and compared to on-going ab-initio simulations. [1] P. Noé et al., “Phase Change Materials for Non-Volatile Memory devices: From Technological Challenges to Materials Science Issues”, Topical Review in Semicond. Sci. Technol., to be published (2017). [2] D. Loke et al. “Breaking the Speed Limits of Phase-Change Memory” Science 336, 1566 (2012) [3] J.P. Geindre et al., “Frequency-domain interferometer for measuring the phase and amplitude of a femtosecond pulse probing a laser-produced plasma” Optics Letters 19, 1997 (1994).

Proceedings Article | 7 March 2016 Paper

Laser assisted bioprinting using a femtosecond laser with and without a gold transductive layer: a parametric study

H. Desrus, B. Chassagne, S. Catros, C. Artiges, R. Devillard, S. Petit, F. Deloison, J. C. Fricain, F. Guillemot, R. Kling

Proceedings Volume 9706, 97060O (2016) https://doi.org/10.1117/12.2209087

KEYWORDS: Gold, Printing, Femtosecond phenomena, Liquids, Ultrafast phenomena, Laser energy, Receivers, Objectives, Microscopes, Tolerancing

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Proceedings Article | 3 May 2013 Paper

An interferometric diagnostic for the experimental study of dynamics of solids exposed to intense and ultrashort radiation

C. Fourment, F. Deneuville, B. Chimier, D. Descamps, F. Dorchies, S. Hulin, S. Petit, O. Peyrusse, J. Santos

Proceedings Volume 8777, 87770M (2013) https://doi.org/10.1117/12.2018982

KEYWORDS: Aluminum, Electrons, Picosecond phenomena, Dielectrics, Phase shifts, Interfaces, Diagnostics, Dielectric polarization, Optical properties, Oxides

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Proceedings Article | 4 March 2011 Paper

Noise performances of a high-power picosecond Nd:YVO4 oscillator

Marie-Christine Nadeau, Stéphane Petit, Philippe Balcou, Sébastien Montant, Christophe Simon-Boisson

Proceedings Volume 7912, 791223 (2011) https://doi.org/10.1117/12.873885

KEYWORDS: Oscillators, Neodymium lasers, Picosecond phenomena, High power lasers, Spectrum analysis, Mode locking, Photodiodes, Laser applications, Crystals, Interference (communication)

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Proceedings Article | 17 May 2010 Paper

High-power passively mode-locked Nd:YVO4 oscillator with adjustable pulse duration between 46 ps and 12 ps

Marie-Christine Nadeau, Stéphane Petit, Philippe Balcou, Romain Czarny, Sébastien Montant, Christophe Simon-Boisson

Proceedings Volume 7721, 77210E (2010) https://doi.org/10.1117/12.853895

KEYWORDS: Picosecond phenomena, Oscillators, Output couplers, Mode locking, Neodymium lasers, Pulsed laser operation, Semiconductor lasers, Mirrors, X-rays, Continuous wave operation

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Proceedings Article | 20 February 2009 Paper

High order harmonic generation at ultra high repetition rate from ytterbium doped fiber chirped pulse amplification

Johan Boullet, Yoann Zaouter, Jens Limpert, Stéphane Petit, Eric Mével, Eric Constant, Eric Cormier

Proceedings Volume 7196, 71960K (2009) https://doi.org/10.1117/12.814858

KEYWORDS: Fiber amplifiers, Xenon, Extreme ultraviolet, Krypton, Harmonic generation, Pulsed laser operation, Argon, Ytterbium, Fiber lasers, Gases

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