Pulsed laser evaporation: equation-of-state effects |
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Authors: | SI Anisimov NA Inogamov AM Oparin B Rethfeld T Yabe M Ogawa VE Fortov |
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Institution: | (1) Landau Institute for Theoretical Physics, Russian Academy of Sciences, 117940 Moscow, Russia, RU;(2) Institute for Theoretical Physics, Technical University Braunschweig, Braunschweig, D-38106, Germany, DE;(3) Department of Energy Sciences, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 226, Japan, JP;(4) High Energy Density Research Center, Joint Institute for High Temperatures, Russian Academy of Sciences, 127412 Moscow, Russia, RU |
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Abstract: | Theoretical study of laser ablation is usually based on the assumption that the vapor is an ideal gas. Its flow is described
by gas dynamics equations 1, 2]. The boundary conditions at vaporization front are derived from the solution of the Boltzmann
equation that describes the vapor flow in the immediate vicinity of the vaporizing surface (so-called Knudsen layer) 1].
This model is applicable within the range of temperatures much lower than the critical temperature of target material. In
the present work, a general case is considered when the temperature of the condensed phase is comparable to or higher than
the critical temperature. The dynamics of both condensed and gaseous phases can be described in this case by the equations
of hydrodynamics. The dynamics of vaporization of a metal heated by an ultrashort laser pulse is studied both analytically
and numerically. The analysis reveals that the flow consists of two domains: thin liquid shell moving with constant velocity,
and thick low-density layer of material in two-phase state.
Received: 2 March 1999 / Accepted: 28 May 1999 / Published online: 21 October 1999 |
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Keywords: | PACS: 81 60Z 65 70 +y 64 60 Ht |
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