16 August 2000 Relaxation processes and formation of thermal shock waves during laser ablation
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Proceedings Volume 4065, High-Power Laser Ablation III; (2000) https://doi.org/10.1117/12.407318
Event: High-Power Laser Ablation, 2000, Santa Fe, NM, United States
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.
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Anastasia S. Gruzdeva, Vitali E. Grudzev, "Relaxation processes and formation of thermal shock waves during laser ablation", Proc. SPIE 4065, High-Power Laser Ablation III, (16 August 2000); doi: 10.1117/12.407318; https://doi.org/10.1117/12.407318


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