后向受激布里渊散射诱导的光学材料破坏机理研究  

Theoretical study on damage induced by stimulated Brillouin scattering process

作　　者：郭少锋[1] 陆启生[1] 程湘爱[1] 赵国民[1] 江厚满[1] 周萍[1] 邓少永[1] 

机构地区：[1]国防科学技术大学理学院,湖南长沙410073

出　　处：《强激光与粒子束》2003年第9期850-854,共5页High Power Laser and Particle Beams

基　　金：国家863计划项目资助课题

摘　　要：　区别于传统的受激布里渊散射(SBS)发生器和放大器,提出了一种新型的SBS模型:自供种子光模型(selfStokesseeding,SSS)。数值求解了SBS耦合波方程组,得到了SBS诱导应力的时空分布。基于SSS建立了高功率激光辐照下光学材料破坏阈值的计算模型,研究了SBS破坏阈值与激光脉宽以及作用区长度的关系。研究发现,SBS作为一种破坏机制,表现为前表面破坏,且破坏阈值与激光脉宽以及作用区长度均成反比。A new SBS model, which is described as self Stokes seeding (SSS), was brought forward and its mechanism was researched. The SBS coupled wave equations are solved numerically and laser induced stress is obtained spatially. Theoretical model is established to study the damage process induced by SSS process and damage thresholds are calculated. Physical characteristics which should be embodied by SBS damage mechanism are analyzed, and the dependence of laser pulse width and interaction length on damage thresholds is presented. The theoretical research shows that the SBS induced damage mostly happens at the entrance surface of pumping laser and the threshold intensity is inversely proportional to the laser pulse width and the interaction length.

关 键 词：光学材料 受激布里渊散射 破坏机理 破坏阈值 傅里叶分析 

分 类 号：TN241[电子电信—物理电子学] O437[机械工程—光学工程]