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Proceedings Paper

Relaxation processes and formation of thermal shock waves during laser ablation
Author(s): Anastasia S. Gruzdeva; Vitali E. Grudzev
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Paper Abstract

One of possible approaches to description of laser-induced heating of transparent materials by femtosecond pulses is discussed. There are considered (1) traditional equation of heat transfer, (2) two- temperature model, (3) modified two-temperature model including relaxation terms and diffusion equation for electron plasma. It is discussed validity of those models for description of early stages of laser-induced heating (within few picoseconds after laser pulse has gone) when non-equilibrium laser-induced electron plasma co- exists with non-equilibrium phonon system. It is proposed to use modified two-temperature model for that early stage while two- temperature model is proposed to be applied for later moments of time when relaxation processes within both electron and phonon subsystems are close to finish and the systems are quasi- equilibrium. Formation of abrupt space variations of temperature similar to shock-wave front is discussed as one of important properties of solutions to modified two-temperature model. That process depends critically on value of linear absorption coefficient and temperature-induced variations of material parameters. Obtained results are discussed from the viewpoint of experimental data on morphology of ablation crates in transparent materials.

Paper Details

Date Published: 16 August 2000
PDF: 10 pages
Proc. SPIE 4065, High-Power Laser Ablation III, (16 August 2000); doi: 10.1117/12.407318
Show Author Affiliations
Anastasia S. Gruzdeva, S.I. Vavilov State Optical Institute (Russia)
Vitali E. Grudzev, S.I. Vavilov State Optical Institute (Russia)

Published in SPIE Proceedings Vol. 4065:
High-Power Laser Ablation III
Claude R. Phipps, Editor(s)

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