Effects of large laser bandwidth on stimulated Raman scattering instability in underdense plasma

Yao Zhao, Lu-Le Yu, Jun Zheng, Su-Ming Weng, Chuang Ren, Chuan-Sheng Liu, Zheng-Ming Sheng

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Abstract

The effects of laser bandwidth on stimulated Raman scattering (SRS) instability in underdense plasma are studied by particle-in-cell simulations. In the simulations, sinusoidal frequency modulation of the incident laser pulse is used. By changing the size of bandwidth, it is shown that the linear growth of SRS can be suppressed considerably, provided the laser bandwidth is much larger than the SRS linear growth rate. Simulations also show that by choosing the proper frequency modulation parameters or decreasing the linear growth rate of SRS, the inhibitory effects become more obvious. The plasma electron temperature tends to weaken the bandwidth effects especially when it is over a keV level. The laser bandwidth can only increase the time duration for linear growth but cannot diminish the instability completely.
Original languageEnglish
JournalPhysics of Plasmas
Publication statusAccepted/In press - 11 May 2015

Keywords

  • lasers
  • bandwidth
  • Raman scattering

Cite this

Zhao, Y., Yu, L-L., Zheng, J., Weng, S-M., Ren, C., Liu, C-S., & Sheng, Z-M. (Accepted/In press). Effects of large laser bandwidth on stimulated Raman scattering instability in underdense plasma. Physics of Plasmas.