抽运光参数对玻璃中受激布里渊散射光能量提取效率的影响  

Influences of Characteristics of Pump Laser on Stimulated Brillouin Scattering Energy Reflectivity

作　　者：邓少永[1] 郭少锋[1] 陆启生[1] 陈燧[2] 林文雄[2] 林宗志[2] 

机构地区：[1]国防科学技术大学光电科学与技术学院,湖南长沙410073 [2]中国科学院福建物质结构研究所,福建福州350002

出　　处：《中国激光》2008年第1期21-26,共6页Chinese Journal of Lasers

基　　金：国家863计划(2002AA824091)资助项目

摘　　要：以K9玻璃与熔石英玻璃代替传统的液体或气体作为纵向受激布里渊散射(LSBS)样品,波长1.064μm,脉宽可调的单纵模电光调Q激光器作抽运光,实验探讨了抽运光脉宽、抽运光能量大小、抽运光脉冲重复频率对纵向受激布里渊散射脉宽压缩效应和散射光能量提取效率的影响。实验结果表明,抽运激光脉冲重复频率高,则散射光能量提取效率高;脉宽小,则散射光能量提取效率高;焦距为500 mm时300 mm长的K9玻璃中得到的散射光能量提取效率比170 mm长的熔石英玻璃高;在抽运光脉冲重复频率为1 Hz时,二者都可以得到90%的散射光能量提取效率。探讨了抽运光为多纵模时,固体介质中受激布里渊散射与光学击穿相伴发生的三种不同情况。实验证明,多纵模情况下固体光学介质中同样可以发生受激布里渊散射;多纵模情况下不一定会对固体光学介质产生光学击穿破坏;光学击穿破坏的发生也不一定会阻止受激布里渊散射的发生,二者可以相伴发生。Fused silica and K9 glasses were used for longitudinal stimulated Brillouin scattering （LSBS） instead of traditional medium of liquids or gases. A single longitudinal mode 1. 064 μm laser which is electro-optical Q- modulation is used as pump laser. Influences of pulse duration, power and pulse repetition of pump laser on pulse compression of LSBS and energy reflectivity of scattering light were investigated. It is concluded that shorter pulse duration is with higher energy reflectivity and high pulse repetition gets higher energy reflectivity. At the same time, energy reflectivity of scattering in 300 mm K9 glass light is higher than that in 170 mm fused silica, when the focus length is 500 mm. And high energy reflectivity above 90% could be obtained in 170 mm fused silica long and 300 mm K9 glass when pump pulse repetition is 1 Hz. LSBS of pump laser with multi-longitudinal mode had been investigated in the experiments and it is proved that the optical breakdown could happen at the same time with SBS.

关 键 词：非线性光学 受激布里渊散射 K9玻璃 熔石英玻璃 重复频率 散射光能量反射率 多纵模 

分 类 号：O437.2[机械工程—光学工程] TN248.13[理学—光学]