Effective suppression of parametric instabilities with decoupled broadband lasers in plasma

Yao Zhao, Suming Weng, Min Chen, Jun Zheng, Hongbin Zhuo, Chuang Ren, Zhengming Sheng, Jie Zhang

Research output: Contribution to journalArticle

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Abstract

A theoretical analysis for the stimulated Raman scattering (SRS) instability driven by two laser beams with certain frequency difference is presented. It is found that strong coupling and enhanced SRS take place only when the unstable regions for each beam are overlapped in the wavenumber space. Hence a threshold of the beam frequency difference for their decoupling is found as a function of their intensity and plasma density. Based upon this, a strategy to suppress the SRS instability with decoupled broadband lasers (DBLs) is proposed. A DBL can be composed of tens or even hundreds of beamlets, where the beamlets are distributed uniformly in a broad spectrum range such as over 10% of the central frequency. Decoupling among the beamlets is found due to the limited beamlet energy and suitable frequency difference between neighboring beamlets. Particle-in-cell simulations demonstrate that SRS can be almost completely suppressed with DBLs under the laser intensity ∼ 1015 W/cm2. Moreover, stimulated Brillouin scattering (SBS) will be suppressed simultaneously with DBLs can be attractive for driving inertial confined fusion.
Original languageEnglish
Article number112102
Number of pages7
JournalPhysics of Plasmas
DOIs
Publication statusPublished - 2 Nov 2017

Keywords

  • stimulated Raman scattering
  • lasers
  • decoupled broadband lasers

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    Zhao, Y., Weng, S., Chen, M., Zheng, J., Zhuo, H., Ren, C., ... Zhang, J. (2017). Effective suppression of parametric instabilities with decoupled broadband lasers in plasma. Physics of Plasmas, [112102]. https://doi.org/10.1063/1.5003420