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Applied Physics A

, Volume 69, Issue 6, pp 617–620 | Cite as

Pulsed laser evaporation: equation-of-state effects

  • S.I. Anisimov
  • N.A. Inogamov
  • A.M. Oparin
  • B. Rethfeld
  • T. Yabe
  • M. Ogawa
  • V.E. Fortov
Regular paper

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.

PACS: 81.60Z; 65.70.+y; 64.60.Ht 

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Copyright information

© Springer-Verlag 1999

Authors and Affiliations

  • S.I. Anisimov
    • 1
  • N.A. Inogamov
    • 1
  • A.M. Oparin
    • 1
  • B. Rethfeld
    • 2
  • T. Yabe
    • 3
  • M. Ogawa
    • 3
  • V.E. Fortov
    • 4
  1. 1.Landau Institute for Theoretical Physics, Russian Academy of Sciences, 117940 Moscow, RussiaRU
  2. 2.Institute for Theoretical Physics, Technical University Braunschweig, Braunschweig, D-38106, GermanyDE
  3. 3.Department of Energy Sciences, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 226, JapanJP
  4. 4.High Energy Density Research Center, Joint Institute for High Temperatures, Russian Academy of Sciences, 127412 Moscow, RussiaRU

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