2 April 2004 Thermodynamical and morphological instabilities in laser-matter interaction
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Proceedings Volume 5399, Laser-Assisted Micro- and Nanotechnologies 2003; (2004) https://doi.org/10.1117/12.552985
Event: Laser-Assisted Micro- and Nanotechnologies 2003, 2003, St. Petersburg, Russian Federation
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.
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A. A. Samokhin, A. A. Samokhin, S. N. Andreev, S. N. Andreev, I. N. Kartashov, I. N. Kartashov, Igor Yu. Smurov, Igor Yu. Smurov, } "Thermodynamical and morphological instabilities in laser-matter interaction", Proc. SPIE 5399, Laser-Assisted Micro- and Nanotechnologies 2003, (2 April 2004); doi: 10.1117/12.552985; https://doi.org/10.1117/12.552985
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