Kinetic simulation of nonlinear stimulated Raman scattering excited by a rotated polarized pump. (22nd August 2019)

• Record Type: Journal Article
• Authors: Zhou, H Y; Xiao, C Z; Jiao, J L; Lang, Y; Zhao, N; Xie, D; Zou, D B; Yin, Y; Shao, F Q; Zhuo, H B
• Is Part Of: Plasma physics and controlled fusion. Volume 61:Number 10(2019)
• Publication Date: 2019-08-22
• Subjects: rotated polarized pump -- kinetic simulation -- nonlinear effect; 52.38.Bv -- 52.35.-g -- 52.35.Fp -- 52.35.Mw; Plasma (Ionized gases) -- Periodicals; Controlled fusion -- Periodicals; 530.44
• DOI: 10.1088/1361-6587/ab34ba
• Languages: English
• ISSNs: 0741-3335

Abstract

Abstract: Particle-in-cell (PIC) simulations are used to study the nonlinear process of stimulated Raman scattering (SRS) excited by a rotated polarized laser interacting with underdense plasmas. The influence of the rotating frequency on linear SRS growth rate is theoretically analyzed and the long-term nonlinear SRS behavior excited by the rotated polarized pump is illustrated by the PIC simulations. Our results show that the evolution of reflectivity, plasma wave and electron energy distribution in the nonlinear stage is quite different from that in the linear stage, which is principally caused by the mitigation of electron trapping. Furthermore, our fluid theory and simulations have demonstrated that opposite to the suppression of Raman backscattering, Raman forward scattering becomes stronger with increasing rotating frequency. The above nonlinear effects are valid in the regime of I ∼ 10 15 W cm − 2, k λ D = 0.3 and a plasma length of hundreds of microns for the key role of the kinetic effect.