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Théorie et simulation de l'interaction des impulsions laser ultracourtes à flux modéré avec un solide métallique

Abstract : Ultrashort laser systems focuses an energy of few microjoules within a pulse of hundred of femtoseconds, so that intensities reach 10^12 to 10^15 W/cm^2. Such ultrashort laser pulses allows accurate metal micro-machining and provides first rate beam parameters for industrial purpose. In this thesis, we propose a theoretical approach to model and simulate the effects induced by such an impulsion.

The ultrafast electronic response drives a strong damage dynamic of the metal lattice. We have developped several models to describe the optical, thermal and hydrodynamical phenomena involved in a material irradiated by a femtosecond laser. Special cares have been devoted to the physical descriptions of the phase transition between the degenerated condensed cold phase and the hot non degenerated plasma. These models have been implemented into a 1-D Lagrangian hydrodynamic code. Comparison between computed ablation rates and experimental results shown good agreements. We also discuss the existence of extreme out of equilibrium states.

An original electrical conductivity model is also set up to take into account the effects of the electron dynamics on the optical properties. Several numerical experiments involving, among others, pump-probe diagnostics, are performed to improve our transport processes (electron-electron and electron-phonon) knowledge in this field. Finally, in order to enhance ablation rate, we used our model to examine temporal pulse shaping effects.
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https://tel.archives-ouvertes.fr/tel-00011110
Contributor : Jean-Philippe Colombier <>
Submitted on : Monday, December 19, 2005 - 6:31:34 PM
Last modification on : Saturday, March 6, 2021 - 3:07:59 AM
Long-term archiving on: : Friday, November 25, 2016 - 10:02:04 AM

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  • HAL Id : tel-00011110, version 2

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Jean-Philippe Colombier. Théorie et simulation de l'interaction des impulsions laser ultracourtes à flux modéré avec un solide métallique. Physique Atomique [physics.atom-ph]. Université Jean Monnet - Saint-Etienne, 2005. Français. ⟨tel-00011110v2⟩

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