抽运光小尺度自聚焦对基于动态波前调控的径向匀滑效果的影响  

Influence of Small-Scale Self-Focusing of Pump Laser on Radial Smoothing Effect Based on Dynamic Wavefront Control

作　　者：李建龙[1] 翁小凤 钟哲强[1] 张彬[1] Li Jianlong;Weng Xiaofeng;Zhong Zheqiang;Zhang Bin(College of Electronics and Information Engineering,Sichuan University,Chengdu,Sichuan 610064,China)

机构地区：[1]四川大学电子信息学院,四川成都610064

出　　处：《中国激光》2019年第3期205-211,共7页Chinese Journal of Lasers

基　　金：国家重大专项应用基础项目(G2017149;JG2017029;JG2018115);科技部创新人才推进计划重点领域创新团队资助项目(2014RA4051)

摘　　要：基于抽运光非线性小尺度自聚焦效应,分析了光克尔介质类型、抽运光光束质量和光克尔介质长度对束匀滑效果的影响。研究结果表明,在基于动态波前调控的径向匀滑方案中,当抽运光的峰值强度一定时,与CS_2相比,采用硝基苯作为光克尔介质可获得较好的束匀滑效果。在实际应用中,抽运光的小尺度自聚焦效应会随着抽运光峰值强度和光克尔介质长度的增加而加剧,因此需要合理选择抽运光和光克尔介质参数,以获得较好的束匀滑效果,避免抽运光小尺度自聚焦效应的影响。Based on the nonlinear small-scale self-focusing effect of pump laser,the influences of optical Kerr medium type,pump laser beam quality,and optical Kerr medium length on the beam smoothing effect are analyzed.The research results show that in the radial smoothing scheme based on dynamic wavefront control,an excellent beam smoothing effect is obtained with nitrobenzene instead of CS2 as the optical Kerr medium when the pump laser peak intensity is constant.In the practical applications,since the small-scale self-focusing effect of pump laser is aggravated with the increase of pump laser peak intensity or optical Kerr medium length,it is necessary to select suitable parameters of pump laser and optical Kerr medium for a good beam smoothing effect.Thus the influence of small-scale self-focusing effect of pump laser can be avoided.

关 键 词：激光光学 惯性约束聚变 径向束匀滑 小尺度自聚焦 均匀性 

分 类 号：TN24[电子电信—物理电子学]