Stimulated Raman scattering in a non-eigenmode regime

Yao Zhao, Suming Weng, Zhengming Sheng, Jianqiang Zhu

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Abstract

Stimulated Raman scattering (SRS) in plasma in a non-eigenmode regime is studied theoretically and numerically. Different from normal SRS with the eigen electrostatic mode excited, the non-eigenmode SRS is developed at plasma density 0.25nc when the laser amplitude is larger than a certain threshold. To satisfy the phase-matching conditions of frequency and wavenumber, the excited electrostatic mode has a constant frequency around half of the incident light frequency, which is no longer the eigenmode of electron plasma wave. Both the scattered light and the electrostatic wave are trapped in plasma with their group velocities being zero. Super-hot electrons are produced by the non-eigen electrostatic wave. Our theoretical model is validated by particle-in-cell simulations. The SRS driven in this non-eigenmode regime is an important laser energy loss mechanism in the laser plasma interactions as long as the laser intensity is higher than.

Original languageEnglish
Article numbere21
Number of pages8
JournalHigh Power Laser Science and Engineering
Volume8
DOIs
Publication statusPublished - 21 May 2020

Keywords

  • hot electrons
  • laser plasma interactions
  • stimulated Raman scattering

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