Influence of nonlinear detuning at plasma wavebreaking threshold on backward Raman compression of non-relativistic laser pulses

A. A. Balakin, G. M. Fraiman, Q. Jia, N. J. Fisch

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Taking into account the nonlinear dispersion of the plasma wave, the fluid equations for the three-wave (Raman) interaction in plasmas are derived. It is found that, in some parameter regimes, the nonlinear detuning resulting from the plasma wave dispersion during Raman compression limits the plasma wave amplitude to noticeably below the generally recognized wavebreaking threshold. Particle-in-cell simulations confirm the theoretical estimates. For weakly nonlinear dispersion, the detuning effect can be counteracted by pump chirping or, equivalently, by upshifting slightly the pump frequency, so that the frequency-upshifted pump interacts with the seed at the point where the plasma wave enters the nonlinear stage.

Original languageEnglish (US)
Article number063106
JournalPhysics of Plasmas
Volume25
Issue number6
DOIs
StatePublished - Jun 1 2018

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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