介质参数对受激布里渊散射脉宽压缩的影响  

Dependence of pulse duration on parameters of medium in Stimulated Brillouin Scattering

作　　者：王超[1] 吕志伟[1] 林殿阳[1] 王晓慧[1] 赵晓彦[1] 汤秀章[2] 张海峰[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,黑龙江哈尔滨150001 [2]中国原子能科学研究院,北京102413

出　　处：《强激光与粒子束》2002年第5期713-716,共4页High Power Laser and Particle Beams

基　　金：国家 8 63惯性约束聚变领域资助课题

摘　　要：利用KrF激光和SF6介质从理论和实验上研究了声子寿命和增益系数等介质参数对SBS脉宽压缩比和能量反射率的影响。理论上采用一维瞬态模型对SBS过程进行数值模拟 ,考虑了瞬态过程、介质吸收以及泵浦耗空的影响 ,计算了SBS介质不同参数对脉冲压缩影响的规律。实验表明 ,在实验参数的变化范围内声子寿命越短、增益系数越小 ,越有利于脉宽压缩。在 0 .6 8MPa下 ,脉宽压缩比达到 8。数值模拟了声子寿命和介质增益系数单独变化时对SBS过程影响的规律 ,发现在声子寿命和增益系数同时变化时 。Stimulated Brillouin Scattering (SBS) is a process to product the phase conjugated light. Now it is being pursued as a means for pulse compression, beam combination and wave-front reversal. To achieve a high quality short pulse beam, to select a proper medium is very important. The effect of parameters of Brillouin mediums on pulse compression of Stimulated Brillouin Scattering process used as a SBS generator are shown theoretically and experimentally. The theoretical model includes transient process, absorption of medium, and pump depletion. The results show that pulse compression ratio is 8 in 0.68 MPa. Dependence of pulse compression on the acoustic lifetime and Brillouin gain coefficients is investigated respectively. The results show that pulse compression versus parameters of medium has the best point, because the gain coefficients of real medium change with its acoustic lifetimes. The theoretical and experimental results are consistent.

关 键 词：介质参数 受激布里渊散射 脉宽压缩 SBS介质 

分 类 号：O437.2[机械工程—光学工程]