Material decomposition mechanisms in femtosecond laser interactions with metals
By M. Povarnitsyn, T. Itina, Marc Sentis, Konstantin V. Khishchenko, P. Levashov. 2007
230 citations recorded by the source corpus.
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.
Subfields: Biomedical Engineering, Computational Mechanics, Mechanics of Materials
View Paper: https://www.semanticscholar.org/paper/3f00681904c3fc10377fbf84418e693f33ee8bcb
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Citations in the corpus
- A review of ultrafast laser materials micromachining (2013, background): “Generally speaking, the characteristics of the ultrafast laser ablation process depend on many factors: not only the material properties, but also laser parameters such as pulse duration and laser fluence will affect the ablation mechanism [19,129,130].”