Dynamics of ultrashort pulse-laser ablation: equation-of-state considerations

Baerbel Rethfeld; Vassili Temnov; Klaus Sokolowski-Tinten; Sergei I. Anisimov; Dietrich von der Linde

doi:10.1117/12.482055

13 September 2002 Dynamics of ultrashort pulse-laser ablation: equation-of-state considerations

Baerbel Rethfeld, Vassili Temnov, Klaus Sokolowski-Tinten, Sergei I. Anisimov, Dietrich von der Linde

Proceedings Volume 4760, High-Power Laser Ablation IV; (2002) https://doi.org/10.1117/12.482055
Event: International Symposium on High-Power Laser Ablation 2002, 2002, Taos, New Mexico, United States

Abstract

Ultrafast time resolved microscopy of femtosecond laser irradiated surfaces reveals a universal feature of the ablating surface on nanosecond time scale. All investigated materials show rings in the ablation zone, which were identified as an interference pattern (Newton fringes). Optically sharp surfaces occur during expansion of the heated material as a result of anomalous hydrodynamic expansion effects. Experimentally, the rings are observed within a certain fluence range which strongly depends on material parameters. The lower limit of this fluence range is the ablation threshold. We predict a fluence ratio between the upper and the lower fluence limit approximately equal to the ratio of critical temperature to boiling temperature at normal pressure. This estimate is experimentally confirmed on different materials (Si, graphite, Au, Al).

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Baerbel Rethfeld, Vassili Temnov, Klaus Sokolowski-Tinten, Sergei I. Anisimov, and Dietrich von der Linde "Dynamics of ultrashort pulse-laser ablation: equation-of-state considerations", Proc. SPIE 4760, High-Power Laser Ablation IV, (13 September 2002); https://doi.org/10.1117/12.482055

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