高功率大口径板条自发辐射放大特性的研究  

Research on Amplification Characteristics of Spontaneous Emission of High-Power and Large-Diameter Slab

作　　者：石月 徐浏[1,2] 于益[1,2] 童立新[1,2] 高清松[1,2] 罗时文 Shi Yue;Xu Liu;Yu Yi;Tong Lixin;Gao Qingsong;Luo Shiwen(Key Laboratory of Scienxce and Technology on High Energy Laser,China Academy of Eagineering Phgsics,Miangag,Sichuan 621999,Chima;Iustitute of Appliedl Electrouics,Chiwa Academy of Eugineering Physics,Mianyang,Sichuan 621999,China;Groduate School of China Academ y of Engineering Ph gysics,Beijing 100088,China)

机构地区：[1]中国工程物理研究院高能激光科学与技术重点实验室,四川绵阳621999 [2]中国工程物理研究院应用电子学研究所,四川绵阳621999 [3]中国工程物理研究院研究生院,北京100088

出　　处：《激光与光电子学进展》2020年第15期116-121,共6页Laser & Optoelectronics Progress

基　　金：中国工程物理研究院高能激光科学与技术重点实验室创新基金(C-2018-3xX5-HEL-05)。

摘　　要：针对高功率大口径Nd:YAG板条放大器自发辐射放大(ASE)的问题,基于几何光学光线追迹手段,提出了一种简化的ASE三维计算模型,修正了荧光侧面的漫反射情况以及受激发射截面温度效应引人的计算误差。通过数值仿真确定了大口径板条(尺寸为150.2mm×40.0mm×2.5mm)各个表面上的荧光反射对ASE效应的贡献权重,计算了不同泵浦功率下小信号的增益情况。通过板条放大实验分析了ASE效应对板条放大性能的影响,并与模拟结果进行对比,验证了计算模型的有效性。Aiming at the problem that the amplification of spontancous emission(ASE)of high-power and large diameter Nd:YAG slab amplifiers a simplified three-dimensional ASE calculation model is proposed based on gcomctric optical ray tracing method,which corrects the diffuse reflection of the fluorescence sidc and the calculation error introduced by the temperature effect of the stimulated emission cross section.Through numerical simulation,the contribution weight of fluorescence reflection of cach surface of large-diamcter slab(size 150.2 mm×40.0 mm ×2.5 mm)to the ASE effect is determined,and the gain of small signal under different pump powers are calculated.The effect of the ASE on the slab amplification performance is analyzed through the slab amplification.Experimental results and numerical caleulations are compared.and the validity of the calculation model is verified.

关 键 词：激光光学 板条放大器 自发辐射放大 小信号增益系数 

分 类 号：O436[机械工程—光学工程]