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Proceedings Paper

Thermodynamical and morphological instabilities in laser-matter interaction
Author(s): A. A. Samokhin; S. N. Andreev; I. N. Kartashov; Igor Yu. Smurov
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Paper Abstract

The possible manifestations of the thermodynamical instability (explosive vaporization) are discussed for different regimes of laser heating of the target. It is shown that repeated explosive vaporization regime can be realized during nanosecond laser pulses provided that nucleation time τ < 10-10s. This regime can be observed if the surface pressure is lower than the critical pressure Pc of the liquid-vapor phase transition. The laser vaporization front instabilities are investigated for the steady state vaporization regime of absorbing condensed matter. The results of the numerical analysis of the dispersion equation are presented for various values of the target absorption coefficient α and different Mach number M ≤ 1 in the vapor flow. In several cases of bulk absorption (α ≤ 104 cm-1) the instability increment maximum γmax is of the order of 109s-1 and the corresponding wavelength λmax ≥ 0.3 μm. The dependence of these results and vaporization dynamics on the sticking (condensation) coefficient in vaporization boundary conditions is also analyzed.

Paper Details

Date Published: 2 April 2004
PDF: 11 pages
Proc. SPIE 5399, Laser-Assisted Micro- and Nanotechnologies 2003, (2 April 2004); doi: 10.1117/12.552985
Show Author Affiliations
A. A. Samokhin, General Physics Institute (Russia)
S. N. Andreev, General Physics Institute (Russia)
I. N. Kartashov, M.V. Lomonosov Moscow State Univ. (Russia)
Igor Yu. Smurov, Ecole Nationale d'Ingenieurs de Saint-Etienne (France)

Published in SPIE Proceedings Vol. 5399:
Laser-Assisted Micro- and Nanotechnologies 2003
Vadim P. Veiko, Editor(s)

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