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Proceedings Paper

Ablation dynamics of solids heated by femtosecond laser pulses
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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. Optically sharp surface 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.

Paper Details

Date Published: 26 June 2001
PDF: 11 pages
Proc. SPIE 4423, Nonresonant Laser-Matter Interaction (NLMI-10), (26 June 2001); doi: 10.1117/12.431221
Show Author Affiliations
Baerbel Rethfeld, Univ. Essen (Germany)
Klaus Sokolowski-Tinten, Univ. Essen (Germany)
V. V. Temnov, Univ. Essen and Institute of Applied Physics (Russia)
Sergei I. Kudryashov, Univ. Essen and M.V. Lomonosov Moscow State Univ. (United States)
Joerg Bialkowski, Univ. Essen (Germany)
Andrea Cavalleri, Univ. of California/San Diego (United States)
Dietrich von der Linde, Univ. Essen (Germany)

Published in SPIE Proceedings Vol. 4423:
Nonresonant Laser-Matter Interaction (NLMI-10)
Mikhail N. Libenson, Editor(s)

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