Distinguishing Raman from strongly coupled Brillouin amplification for short pulses

Qing Jia, Ido Barth, Matthew R. Edwards, Julia M. Mikhailova, Nathaniel J. Fisch

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Plasma-based amplification by strongly coupled Brillouin scattering has recently been suggested for the compression of a short seed laser to ultrahigh intensities in sub-quarter-critical-density plasmas. However, by employing detailed spectral analysis of particle-in-cell simulations in the same parameter regime, we demonstrate that, in fact, Raman backscattering amplification is responsible for the growth and compression of the high-intensity, leading spike, where most of the energy compression occurs, while the ion mode only affects the low-intensity tail of the amplified pulse. The critical role of the initial seed shape is identified. A number of subtleties in the numerical simulations are also pointed out.

Original languageEnglish (US)
Article number053118
JournalPhysics of Plasmas
Volume23
Issue number5
DOIs
StatePublished - May 1 2016

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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