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Ilnitsky, D K; Khokhlov, V A; Zhakhovsky, V V; Petrov, Yu V; Migdal, K P; Inogamov, N A
Journal of physics. Conference series, 11/2016, Volume: 774, Issue: 1Journal Article
Study of material flow in two-temperature states is needed for a fundamental understanding the physics of femtosecond laser ablation. To explore phenomena at a very early stage of laser action on a metallic target our in-house two-temperature hydrodynamics code is used here. The early stage covers duration of laser pulse with next first few picoseconds. We draw attention to the difference in behavior at this stage between the cases: (i) of an ultrathin film (thickness of order of skin depth dskin or less), (ii) thin films (thickness of a film is 4-7 of dskin for gold), and (iii) bulk targets (more than 10dskin for gold). We demonstrate that these differences follow from a competition among conductive cooling of laser excited electrons in a skin layer, electron-ion coupling, and hydrodynamics of unloading caused by excess of pressure of excited free electrons. Conductive cooling of the skin needs a heat sink, which is performed by the cold material outside the skin. Such sink is unavailable in the ultrathin films.
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