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Collective stimulated Brillouin scattering modes of two crossing laser beams with shared scattered wave

查看全文 作　　者：Jie [1]Qiu;Liang [1]Hao;Lihua [1,2]Cao;Shiyang [1]Zou 高影响力作者 机构地区：[1]Institute of Applied Physics and Computational Mathematics,Beijing 100094,China;[2]HEDPS,Center for Applied Physics and Technology,Peking University,Beijing 100871,China高影响力机构 出　　处：《Matter and Radiation at Extremes》索引2021年第6卷第6期,共11页高影响力期刊 摘　　要：In inertial confinement fusion(ICF),overlapping of laser beams is common.Owing to the effective high laser intensity of the overlapped beams,the collective mode of stimulated Brillouin scattering(SBS)with a shared scattered light wave is potentially important.In this work,an exact analytic solution for the convective gain coefficient of the collective SBS modes with shared scattered wave is presented for two overlapped beams based on a linear kineticmodel.The effects of the crossing angle,polarization states,and finite beamoverlapping volume of the two laser beams on the shared light modes are analyzed for cases with zero and nonzero wavelength difference between the two beams.It is found that all these factors have a significant influence on the shared lightmodes of SBS.Furthermore,the out-of-plane modes,in which the wavevectors of daughter waves lie in different planes from the two overlapped beams,are found to be important for certain polarization states and especially for obtuse crossing angles.In particular,adjusting the polarization directions of the two beams to be orthogonal to each other or tuning the wavelength difference to a sufficiently large value(of the order of nanometers)are found to be effective methods to suppress the shared light modes of SBS.This work will be helpful for comprehending and suppressing collective SBS with shared scattered waves in ICF experiments. 关 键 词：POLARIZATION SCATTERING tuning
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