Material decomposition mechanisms in femtosecond laser interactions with metals

Details Material decomposition mechanisms in femtosecond laser interactions with metals Material decomposition mechanisms in femtosecond laser interactions with metals

2007-06-10

arxiv.org/abs/0706.1371v1

Physics

Computational Physics

Submitted to Physical Review B, 12 pages, 3 figures

Scientific paper

10.1103/PhysRevB.75.235414

A numerical hydrodynamic study of femtosecond laser ablation is presented. A detailed analysis of material decomposition is performed using a thermodynamically complete equation of state with separate stable and metastable phase states and phase boundaries. The lifetime of the metastable liquid state is estimated based on the classical theory of homogeneous nucleation. In addition, mechanical fragmentation of the target material is controlled based on available criteria. As a result, several ablation mechanisms are observed. A major fraction of the ablated material, however, is found to originate from the metastable liquid region, which is decomposed either thermally in the vicinity of the critical point into a liquid-gas mixture, or mechanically at high strain rate and negative pressure into liquid droplets and chunks. The calculation results explain available experimental findings.

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