Relaxation processes and formation of thermal shock waves during laser ablation

Anastasia S. Gruzdeva; Vitali E. Grudzev

doi:10.1117/12.407318

16 August 2000 Relaxation processes and formation of thermal shock waves during laser ablation

Anastasia S. Gruzdeva, Vitali E. Grudzev

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

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.

Citation Download Citation

Anastasia S. Gruzdeva and 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); https://doi.org/10.1117/12.407318

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available