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The Coupling Of Stimulated Raman And Brillouin Scattering In A Plasma, Donald P. Umstadter, W.B. Mori, C. Joshi

Donald Umstadter Publications

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. …