Strongly Enhanced Stimulated Brillouin Backscattering in an Electron-Positron Plasma

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Abstract

Stimulated Brillouin backscattering of light is shown to be drastically enhanced in electron-positron plasmas, in contrast to the suppression of stimulated Raman scattering. A generalized theory of three-wave coupling between electromagnetic and plasma waves in two-species plasmas with arbitrary mass ratios, confirmed with a comprehensive set of particle-in-cell simulations, reveals violations of commonly held assumptions about the behavior of electron-positron plasmas. Specifically, in the electron-positron limit three-wave parametric interaction between light and the plasma acoustic wave can occur, and the acoustic wave phase velocity differs from its usually assumed value.

Original languageEnglish (US)
Article number015004
JournalPhysical review letters
Volume116
Issue number1
DOIs
StatePublished - Jan 8 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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