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Stimulated Raman scattering in a non-eigenmode regime

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Abstract

Stimulated Raman scattering (SRS) in plasma in a non-eigenmode regime is studied theoretically and numerically. Different from normal SRS with the eigen electrostatic mode excited, the non-eigenmode SRS is developed at plasma density $n_{e}>0.25n_{c}$ when the laser amplitude is larger than a certain threshold. To satisfy the phase-matching conditions of frequency and wavenumber, the excited electrostatic mode has a constant frequency around half of the incident light frequency $\unicode[STIX]{x1D714}_{0}/2$, which is no longer the eigenmode of electron plasma wave $\unicode[STIX]{x1D714}_{pe}$. Both the scattered light and the electrostatic wave are trapped in plasma with their group velocities being zero. Super-hot electrons are produced by the non-eigen electrostatic wave. Our theoretical model is validated by particle-in-cell simulations. The SRS driven in this non-eigenmode regime is an important laser energy loss mechanism in the laser plasma interactions as long as the laser intensity is higher than $10^{15}~\text{W}/\text{cm}^{2}$.

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DOI:10.1017/hpl.2020.22

基金项目:This work was supported by the Natural Science Foundation of Shanghai (No. 19YF1453200), the Strategic Priority Research Program of Chinese Academy of Sciences (Nos. XDA25050800 and XDA25050100), the National Natural Science Foundation of China (Nos. 11775144 and 1172109), and the National Science and Technology Innovation Foundation of the Chinese Academy of Sciences (No. CXJJ-20S015). The authors would like to acknowledge the OSIRIS Consortium, consisting of UCLA and IST (Lisbon, Portugal), for providing access to the OSIRIS 4.0 framework.

收稿日期:2020-04-06

录用日期:2020-04-24

网络出版日期:2020-05-22

作者单位    点击查看

Yao Zhao:Key Laboratory of High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai201800, China
Suming Weng:Key Laboratory for Laser Plasmas (MoE), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai200240, China;Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai200240, China
Zhengming Sheng:Key Laboratory for Laser Plasmas (MoE), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai200240, China;Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai200240, China;SUPA, Department of Physics, University of Strathclyde, GlasgowG4 0NG, UK
Jianqiang Zhu:Key Laboratory of High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai201800, China;Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai200240, China

联系人作者:Yao Zhao(yaozhao@siom.ac.cn)

备注:This work was supported by the Natural Science Foundation of Shanghai (No. 19YF1453200), the Strategic Priority Research Program of Chinese Academy of Sciences (Nos. XDA25050800 and XDA25050100), the National Natural Science Foundation of China (Nos. 11775144 and 1172109), and the National Science and Technology Innovation Foundation of the Chinese Academy of Sciences (No. CXJJ-20S015). The authors would like to acknowledge the OSIRIS Consortium, consisting of UCLA and IST (Lisbon, Portugal), for providing access to the OSIRIS 4.0 framework.

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引用该论文

Yao Zhao, Suming Weng, Zhengming Sheng, and Jianqiang Zhu, "Stimulated Raman scattering in a non-eigenmode regime," High Power Laser Science and Engineering 8(2), e21 (2020)

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