Abstract
Brillouin and Raman backscattering can be enhanced by reflective feedback from underdense plasma structures, such as quarter-critical density profile steepening due to two-plasmon decay. Rapid time modulation of broadband scatter can be explained by modulation of the feedback from a variation of the round trip phase shift due either to motion of the feedback surface, in Brillouin backscattering, or by periodic creation and destruction of the feedback surface itself, as in Raman backscattering.
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