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Proceedings Paper

Expansion of laser-produced plasma
Author(s): S. B. Bazarov; V. V. Kostin; Nikolai E. Andreev
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Paper Abstract

Irradiation of a solid target with a high power laser beam pressures in the matter up to tens and hundreds Mbar by the ablating plasma. The measurement of induced shock pressures is very useful and a sensitive parameter for optimizing compression in the inertial confinement fusion research for various experimental conditions (laser wavelength, pulse duration, etc.). On the other hand, such ultrahigh-pressure shock waves, which are not achievable in conventional laboratory experiments (flyer impact, explosive loads), have led to a strong interest in obtaining data measurements. Numerical simulation of laser-target interaction was conducted by many authors. One- and two-dimensional codes were used for these investigations. Because of the physical difficulty described phenomena it was used the different physical models with much simplicity proposition. Full description of laser-matter interaction must include such problems as: laser energy absorption, transport of the irradiated energy and subsequent ablation of the target; interaction of the ablated plasma with the ambient gas and formation of a shock and rarefaction waves; dependence of the energy absorption on the angle incidence and polarization of the laser pulse; instability fimbriation and evolution; fluency of the electromagnetic fields on the ablated plasma motion, both the early equilibrium and later nonequilibrium chemistry processes; electron-lattice relaxation phenomenon; irradiation of the plasma in the ambient gas, and so on. Metal (aluminum) targets with thickness 250 nm were used. Parameters of the laser pulse varies in range: intensity I equals 1013 - 1015 W/cm2, duration varies in the range from 30 fs to 200 fs, wavelength lambda equals 0.35 mkm. The investigation has been performed by the 2-D Godunov's numerical scheme.

Paper Details

Date Published: 4 April 1997
PDF: 10 pages
Proc. SPIE 3093, Nonresonant Laser-Matter Interaction (NLMI-9), (4 April 1997); doi: 10.1117/12.271681
Show Author Affiliations
S. B. Bazarov, Moscow State Univ. (Russia)
V. V. Kostin, High Energy Density Research Ctr. (Russia)
Nikolai E. Andreev, High Energy Density Research Ctr. (Russia)

Published in SPIE Proceedings Vol. 3093:
Nonresonant Laser-Matter Interaction (NLMI-9)
Vitali I. Konov; Mikhail N. Libenson, Editor(s)

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