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Stimulated scattering from laser produced plasma

Published online by Cambridge University Press:  09 March 2009

A. A. Offenberger ,
J. Santiago ,
M. Fujita ,
R. Fedosejevs  and
W. Rozmus
A. A. Offenberger
Affiliation:
Department of Electrical Engineering
J. Santiago
Affiliation:
Department of Electrical Engineering
M. Fujita
Affiliation:
Department of Electrical Engineering
R. Fedosejevs
Affiliation:
Department of Electrical Engineering
W. Rozmus
Affiliation:
Department of Physics University of Alberta, Edmonton, Alberta, Canada T6G 2E1
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Abstract

Stimulated Brillouin and Raman scattering are of considerable interest because of their importance to basic nonlinear plasma physics phenomena and to laser-driven inertial confinement fusion. Induced scattering can be substantial for high intensity (I), long wavelength (λ) lasers because the instability growth rates depend exponentially on Jλ2, and also for short wavelength, long scalelength (L) laser/plasma interaction because of nearly homogeneous or large convective gain conditions. Experimental results from both KrF and CO2 laser/plasma interaction studies are presented to illustrate important wavelength dependent features of induced scattering such as the nature of the instability (absolute, convective), threshold, spectra, reflectivity and saturation effects. Backscattering characteristics have been measured for solid target plasmas (aluminum, gold) produced by KrF laser pulses focused to intensities <1014 W/cm2 and gas targets (hydrogen, oxygen) by CO2 laser pulses at intensities <1013 W/cm2. Collisional absorption dominates the KrF laser experiments, whereas particle heating and increased Landau damping dominate the CO2 laser experiments. Current theoretical work concerned with nonlinear effects in Langmuir wave localization, wave collapse and particle heating (generating characteristic high temperature electrons) is also presented.

Type
Research Article
Information
Laser and Particle Beams , Volume 8 , Issue 1-2 , January 1990 , pp. 153 - 171
Copyright
Copyright © Cambridge University Press 1990

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