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

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.
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [5]
  1. Key Laboratory for Laser Plasmas (MoE) and Department of Physics and Astronomy, IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240 (China)
  2. Department of Mechanical Engineering and Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14627 (United States)
  3. (United States)
  4. East-West Space Science Center, University of Maryland, College Park, Maryland 20742, USA and Chao Kuang Piu College, University of Macau, Macau 999078 (China)
  5. (United Kingdom)
Publication Date:
OSTI Identifier:
22410299
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ELECTRON TEMPERATURE; FREQUENCY MODULATION; KEV RANGE; LASER RADIATION; PLASMA SIMULATION; PULSES; RAMAN EFFECT