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Updated: Mar 26, 2026

High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
Published on: September 22, 2017
Strongly Enhanced Stimulated Brillouin Backscattering in an Electron-Positron Plasma
Matthew R Edwards1, Nathaniel J Fisch2, Julia M Mikhailova1,3
1Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, USA.
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.
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