超强激光在均匀等离子体中的背向拉曼散射放大机制  

Amplification mechanism in stimulated Raman backward scattering of ultraintense laser in uniform plasma

作　　者：王媛媛 王羡之 宋贾俊 张旭[1,2] 王兆华 魏志义[1,2] Wang Yuan-Yuan;Wang Xian-Zhi;Song Jia-Jun;Zhang Xu;Wang Zhao-Hua;Wei Zhi-Yi(Key Laboratory of Optical Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physics,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院物理研究所,光物理重点实验室,北京100190 [2]中国科学院大学物理科学学院,北京100049

出　　处：《物理学报》2022年第5期227-232,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11774410);中国科学院战略性先导科技专项(批准号:XDB16030200)资助的课题。

摘　　要：使用等离子体背向受激拉曼散射对激光进行放大时,等离子体的密度、温度和长度都会对激光的放大效果产生影响.为了探究等离子体密度对结果的影响,本文使用一维粒子模拟程序模拟了波长为800 nm的泵浦激光入射到均匀等离子体中,等离子体密度和泵浦光光强对散射光光谱的影响.模拟结果表明,等离子体密度降低会导致散射光的波长变短,而泵浦光的光强在一定范围内降低会增加散射光中背向散射光的比例.通过分析散射光的光强和等离子体的密度,发现前向拉曼散射是等离子体密度变化的原因.模拟结果对等离子体背向受激拉曼散射放大的实验研究具有重要的指导意义.The density,temperature and length of the plasma used in the backward Raman amplification will all influence the result.To explore the influence of the plasma density and the pump intensity,this work uses the one-dimensional particle in cell(PIC)algorithm to simulate the process of the 800 nm pump laser injecting into the plasma.By analyzing the Raman scattered light,it is found that as the density of plasma increases,the wavelengths of the scattered light shorten.It is also found that the forward Raman scattering will cause the plasma density to change,which in turn influences the scattered light wavelength.Therefore,we should choose the plasma density based on the wavelength of the pump and the scattered light,while the amplification of the scattered is related to the pump intensity.

关 键 词：等离子体 激光放大 背向拉曼散射 粒子算法 

分 类 号：O53[理学—等离子体物理] TN249[理学—物理]