Dr. Nicolas Huot Profile

Dr. Nicolas Huot

at Univ Jean Monnet Saint-Etienne

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Author

Publications (13)

Proceedings Article | 24 February 2009 Paper

Dynamic ultrafast laser beam tailoring for multispot photo-inscription of photonic devices in bulk transparent materials

C. Mauclair, G. Cheng, N. Huot, E. Audouard, A. Rosenfeld, I. Hertel, R. Stoian

Proceedings Volume 7205, 720512 (2009) https://doi.org/10.1117/12.808798

KEYWORDS: Waveguides, Femtosecond phenomena, Refractive index, Silica, Modulation, Ultrafast lasers, Photonic devices, Wavefronts, Phase shift keying, Light wave propagation

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Proceedings Article | 14 May 2008 Paper

Designing laser-induced refractive index changes in "thermal" glasses

R. Stoian, A. Mermillod-Blondin, C. Mauclair, N. Huot, E. Audouard, I. Burakov, N. Bulgakova, Y. Meschcheryakov, A. Rosenfeld, A. Husakou, I. Hertel

Proceedings Volume 7005, 700518 (2008) https://doi.org/10.1117/12.783449

KEYWORDS: Refractive index, Glasses, Waveguides, Pulsed laser operation, Monochromatic aberrations, Picosecond phenomena, Ultrafast lasers, Interfaces, Dispersion, Wave propagation

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Proceedings Article | 20 February 2007 Paper

Noncryogenic 10-kHz Ti:sapphire amplifier

G. Matras, N. Huot, E. Baubeau, E. Audouard

Proceedings Volume 6451, 645111 (2007) https://doi.org/10.1117/12.700418

KEYWORDS: Crystals, Femtosecond phenomena, Laser crystals, Amplifiers, Micromachining, Optical amplifiers, Mirrors, Optical pumping, Thermal effects, Laser systems engineering

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Proceedings Article | 29 September 2006 Paper

Programmable focal spot shaping of amplified femtosecond laser pulses and their application to micromachining

Nicolas Huot, Nicolas Sanner, Eric Audouard

Proceedings Volume 6400, 64000K (2006) https://doi.org/10.1117/12.689032

KEYWORDS: Femtosecond phenomena, Wavefronts, Beam shaping, Micromachining, Waveguides, Liquid crystals, Adaptive optics, Laser drilling, Phase modulation, Light valves

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Proceedings Article | 1 March 2006 Paper

Suited simulations for optimal ultrafast laser processing of metals

J. Colombier, P. Combis, H. Huot, H. Soder, E. Audouard

Proceedings Volume 6106, 61060L (2006) https://doi.org/10.1117/12.644505

KEYWORDS: Laser ablation, Metals, Electrons, Liquids, Ultrafast phenomena, Optical simulations, Pulsed laser operation, Picosecond phenomena, Ultrafast lasers, Laser processing

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Proceedings Article | 12 April 2005 Paper

Time-dependent analysis of copper HyBrID laser beam quality

Nicolas Huot, Eric Audouard, Pierre Laporte, Jean-Paul Pique

Proceedings Volume 5708, (2005) https://doi.org/10.1117/12.590458

KEYWORDS: Copper, Resonators, Copper vapor lasers, Laser resonators, Confocal microscopy, Mirrors, Data modeling, Pulsed laser operation, Output couplers, Diffraction

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Proceedings Article | 12 April 2005 Paper

Spatial beam shaping of femtosecond pulses with an optically addressed light valve

Nicolas Sanner, Nicolas Huot, Eric Audouard, Christian Larat, Jean-Pierre Huignard

Proceedings Volume 5708, (2005) https://doi.org/10.1117/12.590353

KEYWORDS: Wavefronts, Femtosecond phenomena, Beam shaping, Light valves, Photovoltaics, Liquid crystals, Micromachining, Phase modulation, Wavefront sensors, Oscillators

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Proceedings Article | 18 February 2004 Paper

Programmable femtosecond beam shaping applied to micromachining

Nicolas Sanner, Nicolas Huot, Eric Audouard, Christian Larat, Jerome Bourderionnet, Arnaud Brignon, Pierre Laporte, Jean-Pierre Huignard

Proceedings Volume 5249, (2004) https://doi.org/10.1117/12.515204

KEYWORDS: Femtosecond phenomena, Beam shaping, Micromachining, Wavefronts, Active optics, Control systems, Sensors, Light valves, Adaptive optics, Spatial resolution

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Proceedings Article | 18 November 2003 Paper

New methods to control quality and precision of micro-machining with femtosecond lasers

Ronan Le Harzic, Nicolas Sanner, Nicolas Huot, C. Donnet, Eric Audouard, Pierre Laporte

Proceedings Volume 5063, (2003) https://doi.org/10.1117/12.540515

KEYWORDS: Femtosecond phenomena, Micromachining, Laser ablation, Copper, Metals, Thermal effects, Aluminum, Polarization, Laser development, Laser applications

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Proceedings Article | 13 September 2002 Paper

Heat-affected zone in microdrilling of metals by femtosecond laser pulses

E. Audouard, R. LeHarzic, Nicolas Huot, Pierre Laporte, S. Valette, R. Fourtunier

Proceedings Volume 4760, (2002) https://doi.org/10.1117/12.482053

KEYWORDS: Femtosecond phenomena, Laser drilling, Transmission electron microscopy, Diffusion, Metals, Aluminum, Microscopy, Statistical analysis, Amplifiers, Thermal modeling

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Several works on laser-matter interaction has shown the differences in sizes for the Heat Affected Zone (HAZ) obtained with nanosecond and femtosecond regimes in laser cutting or drilling. To understand more clearly the basic phenomena that occur in femtosecond regime during the absorption of light by matter, and specially in the case of metals, we have developed both an experimental and a theoretical approach. We use a new method aimed at quantifying the dimensions of the HAZ, using thin-down samples which are micro-drilled and then observed by a transmission electronic microscopy (TEM) technique. The grain size in the samples is analysed near the micro-holes. According to theoretical studies, the thermal diffusion is due to the smaller value of the electron specific heat compared to the lattice one. The thermal diffusion length is found to be a few hundred of nanometers in the case of metals. We use a thermal model to describe the heat diffusion in the sample in order to obtain a theoretical estimation of the HAZ. Holes are drilled in Aluminum using nanosecond and femtosecond laser pulses and characterized by Transmission Electronic Microscopy (TEM). The method for quantifying the dimensions of the heat affected zone (HAZ) surrounding micro-holes is based on the analyze of the grain size evolution. The experiments are using the same Ti-Sapphire laser source (1 kHz, 800 nm). The regeneratively amplified ultra-short pulses (150 fs) are utilized at a low fluence regime (typically 0.01-0.5 mJ/pulse), while the longer pulses (ns) are obtained from the regenerative amplifier without oscillator seeding (0.5 mJ,τ approximately 7-8 ns). The main conclusion is that a 40 micrometers wide HAZ is induced by nanosecond pulses, whereas the femtosecond regime does not produce any TEM observable HAZ. It has to be noticed that the width of the femtosecond HAZ is roughly less than 2 micrometers , which is our observation limit. These results are in agreement with theoretical predictions.

Proceedings Article | 18 June 2002 Paper

TEM investigations of thermal effects on material structure induced by femtosecond and nanosecond laser processing

Ronan Le Harzic, Serge Valette, Nicolas Huot, E. Audouard, E. Baubeau, Christian Jonin, Pierre Laporte

Proceedings Volume 4637, (2002) https://doi.org/10.1117/12.470617

KEYWORDS: Femtosecond phenomena, Transmission electron microscopy, Laser drilling, Aluminum, Microscopy, Scanning electron microscopy, Thermal effects, Micro cutting, Amplifiers, Optical amplifiers

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Proceedings Article | 4 December 1998 Paper

Optimization of reflectivity, rise time and fidelity of a self-pumped phase conjugate BaTiO3:Rh ring mirror at 1.06 um

Nicolas Huot, Jean-Michel Jonathan, Gilles Pauliat, Daniel Rytz, Gerald Roosen

Proceedings Volume 3491, (1998) https://doi.org/10.1117/12.328608

KEYWORDS: Phase conjugation, Mirrors, Reflectivity, Crystals, Ferroelectric materials, Rhodium, Laser sources, Wavefronts, Nd:YAG lasers

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It is now well known that rhodium doped barium titanate (BaTiO3:Rh) exhibits a significant photorefractive response at near infrared wavelengths .We studied and characterized this crystal at 1 .06 jtm by two-wave mixing experiments. In a 45°-cut crystal with a low absorption (0.1 cm1), we measured a photorefractive gain F of 23 cm1 with cw illumination and 16.6 cm1 with nanosecond illumination. Using spectroscopic determinations of the photorefractive sites 2(Rh3+, Rh4+, RhS+), we demonstrated that the photorefractive properties of BaTiO3:Rh are well described by a three charge state model '. Internal parameters of the material were derived using these experimental characterizations which allowed to accurately predict its performances at 1 .06 tm. Comparative characterizations of several BaTiO3 :Rh samples proved that this material is now well reproducible. Reproducibility, high photorefractive gain, low absorption and accurate theoretical description make BaTiO3:Rh a good candidate for realization and optimization of non linear functions like optical phase conjugation. The application we are interested in, is the dynamic wavefront correction of nanosecond Nd:YAG master-oscillator power amplifier (MOPA) laser sources. We implemented a ring self-pumped phase conjugate mirror using a BaTiO3:Rh crystal . This geometry brings several advantages. The threshold in terms of "gain X interaction length" product, is low (F1=2) 6 This phase conjugate mirror does not require a source of long coherence length 7and the gratings involved in the four wave mixing process can be well controled. Moreover the phase conjugate beam can be efficiently selected among the backscattered light by inserting optical elements in the ring 8,9• Such a self-pumped mirror is self-starting and the four-wave mixing process is initiated by the beam-fanning. To avoid spurious internal oscillations in total reflection on the crystal faces that initially developed in several of our experiments and prevented phase conjugation we optimized the geometry of the crystal. Roof-cut, 45° orientation of the c axis and antireflection coatings of the crystal suppressed these internal oscillations and efficient phase conjugation was demonstrated.

Proceedings Article | 9 October 1998 Paper

Self-pumped phase conjugate BaTiO3:Rh ring mirror at 1.06 um: optimization of reflectivity, rise time, and fidelity

Nicolas Huot, Jean-Michel Jonathan, Gilles Pauliat, Daniel Rytz, Gerald Roosen

Proceedings Volume 3470, (1998) https://doi.org/10.1117/12.326849

KEYWORDS: Phase conjugation, Mirrors, Reflectivity, Crystals, Ferroelectric materials, Laser sources, Rhodium, Four wave mixing, Laser crystals

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Showing 5 of 13 publications

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