- Conference date: 18–22 April 2010
- Location: Santa Fe, (New Mexico)
The behavior of micron‐sized gold films irradiated by a femtosecond laser is investigated via molecular dynamics simulations. The ultrafast laser heating induces a stress‐confined state near the surface of the film. For sufficient laser fluences, decomposition of the stress‐confined state leads to ablation of molten material in the frontal and spallation of crystalline solid at the rear sides of the sample. Simulations for thick films (>0.5 μm) give distinct fluence thresholds for ablation and spallation of 137 and respectively, whereas for thin films only a single fracture process is observed. For thin films, it is shown that absorbed fluence at fracture threshold is a function of foil thickness. As foil thickness is decreased to the limit of very thin foils, the stress‐confinement picture becomes increasingly less valid.
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