Thermodynamic modeling of pulsed-laser-induced ablation

Sebastiano Tosto

doi:10.1117/12.513606

9 April 2003 Thermodynamic modeling of pulsed-laser-induced ablation

Sebastiano Tosto

Proceedings Volume 5131, Third GR-I International Conference on New Laser Technologies and Applications; (2003) https://doi.org/10.1117/12.513606
Event: Third GR-I International Conference on New Laser Technologies and Applications, 2003, San Diego, CA, United States

Abstract

The concept of equilibrium has a fundamental importance in thermodynamics and is related to the reversibility of any chemical and physical process involving a temperature cycle or a phase change. It is of major interest also for the models of high energy beam processing; a recent ablation model has shown that the non-equilibrium character of laser irradiation with pulse lengths τ of the order of some ns is essential to understand the mechanisms of thermal sputtering, in particular when overheating of a molten layer of metal surface is allowed to occur. It is known in fact that if the heating or surface recession rates overcome the nucleation rate of vapor bubbles, then the surface temperature T_s of the molten layer can increase above the thermodynamic boiling point T_b. This situation entails by consequence the rising of a temperature gradient within the boiling layer, whose thickness λ is controlled by the condition T ≥ T_b.

Citation Download Citation

Sebastiano Tosto "Thermodynamic modeling of pulsed-laser-induced ablation", Proc. SPIE 5131, Third GR-I International Conference on New Laser Technologies and Applications, (9 April 2003); https://doi.org/10.1117/12.513606

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