Dr. Pierre Laporte Profile

Dr. Pierre Laporte

at Séminaire Provincial Saint-Irénée

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Author

Publications (10)

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 | 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 February 2004 Paper

Optical systems in ultrafast biophotonics

Pierre Laporte, Stephane Ramstein, Stephane Mottin

Proceedings Volume 5249, (2004) https://doi.org/10.1117/12.514036

KEYWORDS: Tissues, Absorption, Luminescence, Biomedical optics, Streak cameras, Tissue optics, In vivo imaging, Brain, Time resolved spectroscopy, Optical design

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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 | 13 September 2002 Paper

Femtosecond lasers: powerful tools for clean material processing

Pierre Laporte, E. Audouard, Florence Garrelie

Proceedings Volume 4760, (2002) https://doi.org/10.1117/12.482104

KEYWORDS: Femtosecond phenomena, Laser ablation, Plasma, Thin films, Pulsed laser operation, Laser-matter interactions, Ultraviolet radiation, Laser development, Particles, Laser applications

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Proceedings Article | 13 September 2002 Paper

Diamond-like carbon deposited by femtosecond pulsed-laser ablation: evidence of nanocrystalline diamond

Florence Garrelie, Anne Loir, Francois Goutaland, C. Donnet, Ronan Le Harzic, Benoit Angleraud, Youcef Ouerdane, Pierre Laporte

Proceedings Volume 4760, (2002) https://doi.org/10.1117/12.482098

KEYWORDS: Femtosecond phenomena, Laser ablation, Raman spectroscopy, Carbon, Ions, Plasmas, Diamond, Particles, Pulsed laser operation, Atomic force microscopy

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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 | 1 May 2002 Paper

In vivo brain spectroscopy with femtosecond white light continuum

Stephane Ramstein, Stephane Mottin, Pierre Laporte

Proceedings Volume 4613, (2002) https://doi.org/10.1117/12.465245

KEYWORDS: 3D modeling, Absorption, In vivo imaging, Capillaries, Brain, Time resolved spectroscopy, Data modeling, Femtosecond phenomena, Spectroscopy, Blood

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Proceedings Article | 6 November 2000 Paper

Micromachining with high-repetition-rate femtosecond laser sources

E. Baubeau, Ronan Le Harzic, Christian Jonin, E. Audouard, Stephane Mottin, M. Courbon, Pierre Laporte

Proceedings Volume 4088, (2000) https://doi.org/10.1117/12.405688

KEYWORDS: Copper, Micromachining, Femtosecond phenomena, Polarization, Laser cutting, Laser ablation, Micro cutting, Laser sources, Combustion, Copper vapor lasers

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Showing 5 of 10 publications

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