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

Journal Article · Fri May 15 04:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4921659· OSTI ID:22410299

Zhao, Yao; Yu, Lu-Le; Zheng, Jun; Weng, Su-Ming ^[1]; Ren, Chuang ^[2]; Liu, Chuan-Sheng ^[3]; Sheng, Zheng-Ming ^[1]

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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. East-West Space Science Center, University of Maryland, College Park, Maryland 20742, USA and Chao Kuang Piu College, University of Macau, Macau 999078 (China)

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.

• OSTI ID: 22410299
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 22; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELECTRON TEMPERATURE
FREQUENCY MODULATION
KEV RANGE
LASER RADIATION
PLASMA SIMULATION
PULSES
RAMAN EFFECT