用于PPLN泵浦源的大能量百纳秒级脉冲固体激光器  

High-power Hundred-nanosecond Pulse Solid-state Laser for PPLN Pump Source

作　　者：汪水兰 王睿 蒋星晨 程德华 岱钦[1] 杨振中 王金凯 WANG Shuilan;WANG Rui;JIANG Xingchen;CHENG Dehua;DAI Qin;YANG Zhenzhong;WANG Jinkai(Shenyang Ligong University,Shenyang 110159,China;Changzheng Engineering Co.,Ltd.,Beijing 101111,China)

机构地区：[1]沈阳理工大学理学院,沈阳110159 [2]航天长征化学工程股份有限公司,北京101111

出　　处：《沈阳理工大学学报》2023年第6期83-88,94,共7页Journal of Shenyang Ligong University

基　　金：辽宁省博士科研启动基金计划项目(2021-BS-161);2022年辽宁省“揭榜挂帅”科技计划重点项目;沈阳理工大学光选科研团队建设项目。

摘　　要：为获得大能量、百纳秒脉宽的1064 nm激光稳定输出,首先理论分析了激光的泵浦能量和谐振腔长度对输出脉宽的影响,然后对Nd∶YAG固体激光器进行设计,采用折叠谐振腔、振荡-放大结构和电光调Q技术相结合。实验结果表明:当重复频率为1 Hz、泵浦电压在1200~1400 V变化时,实现了脉宽范围为152.6~95.71 ns的稳定1064 nm激光输出,最大单脉冲能量可达171 mJ;以激光器的输出激光作为基频光,设计了柱透镜组光束耦合系统,将基频光光斑整形为椭圆形状,实现了基频光的高效耦合和周期极化LiNbO_(3)(PPLN)光参量振荡器的稳定运行;采用耦合后的光束泵浦MgO∶PPLN晶体,获得了1.47μm近红外信号光的稳定输出。To achieve stable output of the 1064 nm laser with high energy and pulse width of hundred-nanosecond,the influence of laser pump energy and resonant cavity length of the laser on laser pulse width is theoretically analyzed.Then the Nd∶YAG solid-state laser is de-signed by using a combination of folded resonant cavity,oscillator-amplifier structure,and e-lectro-optic Q-switched technology.The experimental results indicate that:when the repeti-tion frequency is 1 Hz and the pump voltage changes between 1200 and 1400 V,the stable 1064 nm laser output is achieved with the pulse width range of 152.6~95.71 ns,and the maximum single pulse energy can be up to 171 mJ;with the output of the laser as the fundamental light,a cylindrical lens group beam coupling system is designed to shape the funda-mental light spot into an elliptical shape,which realizes the efficient coupling of the funda-mental light and stable function of the periodically polarized LiNbO_(3)(PPLN)optical para-metric oscillator;the stable output of 1.47μm near-infrared signal light is achieved by pum-ping MgO∶PPLN with the coupled beam.

关 键 词：百纳秒脉宽 大能量 光束耦合 光参量振荡 

分 类 号：TN248.1[电子电信—物理电子学]