激光二极管抽运Nd∶YAG晶体准三能级的热效应研究  

Research of Quasi-Three-Level Thermal Effect of Laser-Diode-Pumped Nd∶YAG Crystal

作　　者：李健[1] 陈锋[1] 张海娟[1] 黄春霞[1] 滑文强[1] 张玉[1] 

机构地区：[1]山东师范大学物理与电子科学学院现代光学实验室,山东济南250014

出　　处：《中国激光》2010年第9期2404-2408,共5页Chinese Journal of Lasers

摘　　要：对激光二极管(LD)端面抽运圆柱状Nd∶YAG晶体产生946 nm激光的热效应进行了分析,考虑了晶体的三能级结构和腔内传播功率分布,修改了热转换系数,得出了更符合实际的晶体内部温度场分布。在抽运功率为15 W时,晶体端面中心的温度由未修改参数前的156.83℃变为246.7℃,提高了89.87℃。对修改参数前后的热焦距进行了计算对比,并对热焦距进行了实验测量,实验结果与理论结果基本吻合。该方法适用于准三能级、三能级激光热效应研究,分析及计算结果为LD端面抽运的固体激光器件的热效应研究及谐振腔优化设计提供一定的参考。The thermal effect of 946 nm laser generated by laser-diode（LD） pumping the columniform Nd∶YAG crystal is analyzed.After considering the quasi-three-level structure of the crystal and the distribution of transmission power in the cavity,a more actual temperature field in the crystal is obtained by revamping the heat conversion coefficient.The temperature of the crystal facet center becomes 246.7 ℃ from the previous 156.83 ℃ before revamping the parameter and increases 89.87 ℃.The thermal focal lengths before and after revamping the parameter are calculated and measured.The experimental result accords with the theoretical result basically.The method can be applied to the laser thermal effect research of quasi-three-level and three-level.The analysis and the result can be referred to the thermal effect research of the solid state laser end-pumped by the LD and the optimal design of resonant cavity.

关 键 词：激光器 热效应 准三能级 热转换系数 

分 类 号：TN248.1[电子电信—物理电子学]