【作者】 龚华平； 吕志伟； 林殿阳；

【Author】 Gong Hua-ping LU Zhi-wei LIN Dian-yang (National Key Laboratory of Tunable Laser Technology.Harbin Institute of Technology,Harbin.Heilongjiang 150001,China)

【机构】 哈尔滨工业大学可调谐激光国家级重点实验室；

【摘要】 以波长1．053μm,脉宽28ns 的 Nd：YLF 激光器作为光源,采用3：1的缩束系统,对非聚焦抽运条件下 CS₂ 液体介质中的受激布里渊散射（SBS）进行了实验研究,获得了受激布里渊散射能量反射率和脉冲宽度随抽运光能量变化的规律,并与聚焦抽运条件下的结果进行了比较。实验结果表明,在非聚焦抽运条件下同样可以产生受激布里渊散射,不同的是阈值能量大幅提高,能量反射率也较聚焦条件下低得多,抽运能量155mJ 时仅为17%,输出能量的不稳定度达到10%。受激布里渊散射脉冲宽度在非聚焦和聚焦条件下的变化几乎一致,都随着抽运能量的增大而变宽,在阈值附近具有最小值,约为16ns。更多还原

【Abstract】 Using 1.053 μm,28 ns Nd:YLF laser as pump source,adopting 3:1 inverse expander,stimulated Brillouin scattering （SBS） in CS₂ liquid media under non-focusing pump is investigated experimentally.The rules of SBS energy reflectivity and pulse width versus pump energy are acquired,and compared with the results of focusing pump.The experimental results indicate that, SBS can be generated under non-focusing pump as also.but the threshold energy increases largely,and energy reflectivity is lower than that of focusing pump,just 17% for 155 mJ input energy.The instability of SBS energy is 10 %.The rules of SBS pulse width versus pump energy are almost consistent with that under focusing pump.The pulse width of SBS is broadened with the increase of pump energy,and has a minimum～16 ns around threshold energy.更多还原