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Proceedings Paper

Dynamics of ultrashort pulse-laser ablation: equation-of-state considerations
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Paper 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).

Paper Details

Date Published: 13 September 2002
PDF: 9 pages
Proc. SPIE 4760, High-Power Laser Ablation IV, (13 September 2002); doi: 10.1117/12.482055
Show Author Affiliations
Baerbel Rethfeld, Univ. Essen (Germany)
Vassili Temnov, Univ. Essen (Germany) and Institute of Applied Physics (Russia) (Germany)
Klaus Sokolowski-Tinten, Univ. Essen (Germany)
Sergei I. Anisimov, L.D. Landau Institute for Theoretical Physics (Russia)
Dietrich von der Linde, Univ. Essen (Germany)

Published in SPIE Proceedings Vol. 4760:
High-Power Laser Ablation IV
Claude R. Phipps, Editor(s)

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