Strongly Enhanced Stimulated Brillouin Backscattering in an Electron-Positron Plasma.


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.

DOI: 10.1103/PhysRevLett.116.015004

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@article{Edwards2016StronglyES, title={Strongly Enhanced Stimulated Brillouin Backscattering in an Electron-Positron Plasma.}, author={Matthew R. Edwards and Nathaniel J. Fisch and Julia M Mikhailova}, journal={Physical review letters}, year={2016}, volume={116 1}, pages={015004} }