4.3μm级联振荡Dy:PbGa_(2)S_(4)高功率中红外激光的理论研究  

Theoretical Study of 4.3μm Cascade Oscillation in Dy:PbGa_(2)S_(4) High-Power Mid-Infrared Laser

作　　者：康民强[1,2] 朱灿林 邓颖 朱启华[1] Kang Minqiang;Zhu Canlin;Deng Ying;Zhu Qihua(Laser Fusion Research Center,China Academy of Engineering Physics,Mianyang,Sichuan 621900,China;Graduate School of China Academy of Engineering Physics,Beijing,100088,China)

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900 [2]中国工程物理研究院研究生院,北京100088

出　　处：《光学学报》2022年第7期193-199,共7页Acta Optica Sinica

基　　金：国家自然科学基金(62075201,61805223,12004352);中国工程物理研究院军民融合基金。

摘　　要：数值模拟了基于级联振荡产生4.3μm高功率连续激光的Dy:PGS激光器。模拟了级联振荡Dy:PGS激光器实现稳定连续输出的全过程,计算给出了激光功率和粒子数密度在谐振腔内的空间分布,分析了泵浦光功率、晶体长度和输出镜反射率对4.3μm激光输出的影响。计算结果表明:级联振荡能有效去除Dy:PGS晶体的自终止效应,获得高功率、高效率的4.3μm激光输出;当1.7μm泵浦光功率为10 W时,4.3μm激光的输出功率可达2.535W,斜率效率为29%;晶体最佳长度区间为12~24mm,闲频光输出镜反射率越高越好,信号光输出镜反射率最佳区间为0.8~0.9。A Dy:PGS laser with 4.3μm high-power continuous laser generated by cascade oscillation is numerically simulated.The whole process of stable continuous output of Dy:PGS laser generated by cascade oscillation is simulated,the laser power and the spatial distribution of population density in the resonant cavity are calculated,and the effects of pump power,crystal length and reflectance of output mirror on 4.3μm laser output are analyzed.The calculation results show that the self-termination effect of Dy:PGS crystal can be eliminated by cascade oscillation,and a 4.3μm laser output with high power and efficiency can be realized.The output power of 4.3μm laser can reach to 2.535W with slope efficiency of 29% when the 1.7μm pump power is 10W.The optimal length range of the crystal is 12--24mm,a higher reflectance of the idler outpot mirror is needed,and the optimal range of the reflectance of the signal output mirror reflectance is 0.8--0.9.

关 键 词：激光器 中红外激光 级联振荡 数值模拟 Dy:PbGa_(2)S_(4)晶体 

分 类 号：O436[机械工程—光学工程]