LD双面侧抽运Nd:GGG热容激光晶体热分析  

Analysis of thermal effect of LD double side pumped Nd:GGG heat capacity laser crystal

作　　者：辛宇[1] 史彭[1] 李隆[1] 白冰[1] 常锐[1] 

机构地区：[1]西安建筑科技大学理学院物理系,西安710055

出　　处：《激光技术》2011年第6期787-791,共5页Laser Technology

基　　金：陕西省教育厅专项科研计划资助项目(09JK536);陕西省科学技术研究发展计划资助项目(2008K05-15)

摘　　要：为了研究矩形晶体Nd:GGG受到具有高斯分布激光双侧错位抽运时,激光晶体内部温度场和热形变分布情况,采用以各向异性半解析热分析为基础的方法进行了研究。当用输出功率分别都为300W从Nd:GGG晶体两侧面错位中心抽运时,高斯半径为9.00mm,最高温度出现在前抽运面,晶体内最大温度为309.73℃;分析了激光晶体工作的特点,建立了符合激光晶体的热模型,得出了矩形Nd:GGG激光晶体温度场和热形变场通解表达式。结果表明,当侧面错位抽运长方体Nd:GGG晶体10s时,最大热形变量为28.97μm,最大光程差为13.02μm;停止抽运200s时,晶体最高温升下降到1.01%。该研究结果为LD双侧抽运热容激光器的优化设计提供了理论依据。Based on the anisotropy semianalytical thermal analysis, the temperature field and thermal distortion of rectangle Nd：GGG crystal in a double side dislocation pumping laser was investigated. A maximum temperature rise of 309. 73℃ happened on the front pumping face and the Gaussian radius w became 9.00mm with two 300W laser diode arrays side-pumping Nd： GGG laser crystal. After analyzing the working characteristics of the laser crystal, a thermal model that matches actual situation of the laser crystal was established, and the analytical expressions of the temperature field and thermal distortion field of the rectangle Nd：GGG laser crystal were obtained. With double side dislocation pumping the rectangle Nd：GGG crystal for 10s, there happened maximum thermal distortion of 28. 97μm and a maximum optical path difference of 13.02 μm. After stopping pumping for 200s, the maximum temperature rise dropped to 1.01%. These results provide theoretical basis for the optimized design of LD double side pumped heat capacity lasers.

关 键 词：激光光学 热形变和光程差 半解析热分析理论 Nd:GGG热容激光晶体 双侧错位抽运 冷却阶段 

分 类 号：TN248.1[电子电信—物理电子学]