2.09μm纳秒钬激光抽运的磷锗锌光参量振荡器  

2.09μm Nanosecond Holmium Laser Pumped ZnGeP_2 Optical Parametric Oscillator

作　　者：王礼[1] 杨经纬[1] 蔡旭武[1] 王金涛[1] 吴海信[1] 吴先友[1,2] 江海河[1,2] 

机构地区：[1]中国科学院安徽光学精密机械研究所,安徽合肥230031 [2]中国科学院合肥物质科学研究院医学物理与技术中心,安徽合肥230031

出　　处：《中国激光》2014年第1期37-40,共4页Chinese Journal of Lasers

基　　金：国家自然科学基金(61275118);国家自然科学基金委员会和中国工程物理研究院联合基金(U1230131);中国科学院知识创新工程重点方向项目(KJCX2-EW-NO7)

摘　　要：高脉冲能量中红外激光在远程大气探测和目标识别中有着重要的应用,为了获得高脉冲能量的中红外激光输出,选用自主生长的ZnGeP2(ZGP)晶体作为中红外参量非线性晶体,晶体采用Ⅰ型相位匹配,切割角度为55°,利用自行研制的2.09μm La3Ga5SiO14(LGS)电光调QCr,Tm,Ho…YAG激光器作为ZGP光参量振荡器(OPO)的抽运源。光参量振荡器采用对抽运光具有反射的双程抽运结构以提高转换效率,采用脉宽约35ns的2.09μm调Q钬激光直接抽运ZGP-OPO,在单谐振振荡结构下获得了脉冲能量为5.9mJ的4.8μm中红外激光输出,光-光转换效率为13.1%,斜率效率为17%;在双谐振振荡结构下获得了脉冲能量为9mJ的3.7μm和4.8μm中红外激光输出,光-光转换效率为23.9%,斜率效率为26.7%。High pulse energy mid-infrared laser has important applications in remote atmospheric detection and object recognition. To obtain high pulse energy mid-infrared laser radiation, a self-grown ZnGeP2 （ZGP） crystal is employed as the nonlinear crystal of optical parametric oscillator, and the cutting angle is 55° with the type Ⅰ phase matching. A self-developed 2.09 μm La3Ga5SiO14 （LGS） electro-optically Q-switched Cr, Tm, Ho：YAG laser is used to pump the ZGP optical parametric oscillator （OPO） directly. The OPO conversion efficiency can be improved with a round-trip pumping way which can reflect pump light. The 2.09 μm Q-switched holmium laser radiation with pulse width of about 35 ns is used to pump the ZGP-OPO directly. Pulse energy of 5.9 mJ at 4.8 μm with an optical-optical conversion efficiency of 13.1% and a slop efficiency of 17% is obtained by the singly resonate operation; pulse energy of 9 mJ at 3.7 μm and 4.8 μm with an optical-optical conversion efficiency of 23.9% and a slop efficiency of 26.7% is obtained by the doubly resonate operation.

关 键 词：激光器 中红外激光 光参量振荡器 ZNGEP2 电光调Q Cr Tm HoYAG 

分 类 号：O436[机械工程—光学工程]