宽带KrF激光抽运的受激布里渊散射反射率研究  

Stimulated Brillouin scattering reflection pumped by broadband KrF laser

作　　者：王晓慧[1] 吕志伟[1] 林殿阳[1] 王超[1] 汤秀章[2] 龚坤[2] 单玉生[2] 

机构地区：[1]哈尔滨工业大学光电子技术研究所 [2]中国原子能科学研究院,北京102413

出　　处：《物理学报》2006年第3期1224-1230,共7页Acta Physica Sinica

基　　金：国家863惯性约束聚变主题项目(批准号:863-804)资助的课题.~~

摘　　要：实验上研究了宽带KrF激光抽运的受激布里渊散射(SBS)随抽运功率密度、介质气压和透镜焦距这三个实验参数的变化规律.在较低的抽运功率密度情况下,SBS反射率随抽运功率密度呈非线性增长;当抽运功率密度提高到一定程度,SBS反射率接近饱和;当功率密度继续增大,SBS反射率随之下降.介质气压提高能够促进SBS的转换.透镜焦距长度的变化使SBS饱和反射率存在一峰值.理论上建立了宽带多模SBS模型,数值模拟结果与实验结果符合得很好,解释了宽带SBS反射率对实验参数的变化规律.Stimulated Brillouin scattering （SBS） reflectivity as a function of pump power density, pressure of medium and focal length for broadband KrF laser pump was investigated experimentally. SBS reflectivity increases nonlineady, approaches to saturation and decreases with the pump power density increasing. The pressure in the medium makes the SBS reflectivity to increase. SBS saturation has a peak value with the focal length from lOcm to lOOcm. Broadband multimode SBS model has been built theoretically. Experimental results agree well with the model.

关 键 词：宽带 KRF激光 受激布里渊散射(SBS) 反射率 

分 类 号：O437.2[机械工程—光学工程] TQ171.112[理学—光学]