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 13.02μm. 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.