The effects of incident light wavelength difference on the collective stimulated Brillouin scattering in plasmas
Author:
Wang Qiang1, Li Zhichao2, Liu Zhanjun13ORCID, Gong Tao2ORCID, Zhang Wenshuai1, Xu Tao2, Li Bin1, Li Ping2ORCID, Li Xin1, Zheng Chunyang13ORCID, Cao Lihua13ORCID, Liu Xincheng2ORCID, Pan Kaiqiang2, Zhao Hang2ORCID, Liu Yonggang2, Deng Bo2, Hou Lifei2, Li Yingjie2, Liu Xiangming2, Li Yulong2, Peng Xiaoshi2, Guan Zanyang2ORCID, Wang Qiangqiang2ORCID, Che Xingsen2ORCID, Li Sanwei2, Yin Qiang2, Zhang Wei2, Xia Liqiong2ORCID, Wang Peng2ORCID, Jiang Xiaohua2, Guo Liang2ORCID, Li Qi2, He Minqing1ORCID, Hao Liang1ORCID, Cai Hongbo13ORCID, Zheng Wudi1, Zou Shiyang1, Yang Dong2, Wang Feng2, Yang Jiamin2ORCID, Zhang Baohan2, Ding Yongkun13, He Xiantu13ORCID
Affiliation:
1. Institute of Applied Physics and Computational Mathematics 1 , Beijing 100094, China 2. Laser Fusion Research Center, China Academy of Engineering Physics 2 , Mianyang, Sichuan 621900, China 3. HEDPS, Center for Applied Physics and Technology, and College of Engineering, Peking University 3 , Beijing 100871, China
Abstract
The first laser–plasma interaction experiment using lasers of eight beams grouped into one octad has been conducted on the Shenguang Octopus facility. Although each beam intensity is below its individual threshold for stimulated Brillouin backscattering (SBS), collective behaviors are excited to enhance the octad SBS. In particular, when two-color/cone lasers with wavelength separation 0.3 nm are used, the backward SBS reflectivities show novel behavior in which beams of longer wavelength achieve higher SBS gain. This property of SBS can be attributed to the rotation of the wave vectors of common ion acoustic waves due to the competition of detunings between geometrical angle and wavelength separation. This mechanism is confirmed using massively parallel supercomputer simulations with the three-dimensional laser–plasma interaction code LAP3D.
Funder
National Natural Science Foundation of China
Subject
Electrical and Electronic Engineering,Nuclear Energy and Engineering,Nuclear and High Energy Physics,Atomic and Molecular Physics, and Optics
Cited by
2 articles.
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