The coupling of stimulated Raman and Brillouin scattering in a plasma

Authors

Donald P. Umstadter, University of Nebraska-LincolnFollow
W.B. Mori, University of California, Los Angeles
C. Joshi, University of California, Los Angeles

Date of this Version

1-1-1989

Comments

Published by American Institute of Physics; Physics Fluids B, 1, 183 (1989). Copyright 1989. Permission to use. http://scitation.aip.org/

Abstract

The observation of an anti-Stokes satellite in the spectrum of light backscattered from a CO₂ laser plasma is reported. Its origin is found to be Thomson scattering of the incident light from a counterpropagating mode-coupled plasma wave. The parent electron and ion waves in the mode-coupling process were driven by stimulated Raman and Brillouin backscattering. The parent and daughter plasma waves were detected by ruby laser Thomson scattering. A computer simulation modeling the experiment shows further cascading of the Stokes backscattered light to lower frequencies, apparently a result of its rescattering from another, higher phase velocity, counterpropagating coupled mode. Comparisons with theoretical predictions are presented.