White-light parametric instabilities in plasmas

R. Bingham, J.E. Santos, L.O. Silva

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Abstract

Parametric instabilities driven by partially coherent radiation in plasmas are described by a generalized statistical Wigner-Moyal set of equations, formally equivalent to the full wave equation, coupled to the plasma fluid equations. A generalized dispersion relation for stimulated Raman scattering driven by a partially coherent pump field is derived, revealing a growth rate dependence, with the coherence width sigma of the radiation field, scaling with 1/sigma for backscattering (three-wave process), and with 1/sigma1/2 for direct forward scattering (four-wave process). Our results demonstrate the possibility to control the growth rates of these instabilities by properly using broadband pump radiation fields.
Original languageEnglish
JournalPhysical Review Letters
Volume98
DOIs
Publication statusPublished - 2007

Keywords

  • plasmas
  • physics
  • white light
  • radiation
  • raman equations

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