空气传热系数对Nd∶YAG微片激光器热形变的影响  

Influence of Air Heat Transfer Coefficient on Thermal Distortion Analysis of Nd∶YAG Microchip Laser

作　　者：常锐[1] 史彭[1] 张瑜[2] 辛宇[1] 白冰[1] 

机构地区：[1]西安建筑科技大学理学院,陕西西安710055 [2]陕西师范大学物理与信息技术学院,陕西西安710062

出　　处：《中国激光》2010年第7期1708-1712,共5页Chinese Journal of Lasers

基　　金：陕西省教育厅专项科研项目(09JK536)和陕西省教育厅工业公关项目(2008K05-15)资助课题

摘　　要：以半解析热分析理论为基础,研究了高斯分布激光二极管(LD)端面抽运背冷式微片Nd∶YAG晶体热效应。通过分析高斯分布LD端面抽运背冷式微片Nd∶YAG晶体工作特点建立热模型,并考虑空气传热系数对晶体温升的影响,利用狄尼级数对第三类热传导方程新的求解方法,得出了微片Nd∶YAG晶体内部温度场。研究结果表明,当抽运总功率为24.2 kW时,在微片晶体端面抽运中心处获得70.17℃最高温升和0.836μm最大热形变。所得结果为LD端面抽运背冷式微片激光器的优化设计提供了依据。Based on the theory of semi-analytical thermal analysis,the thermal effects within a laser diode（LD）-end-pumped Nd∶YAG microchip crystal with back surface cooling are investigated.Through the working characteristics analysis of Nd∶YAG microchip crystal that is pumped by a LD with a Gaussian distribution,a thermal model is established.The temperature field in the microchip Nd∶YAG crystal is obtained by a novel solution to solve the third find heat conduction equation with Dini series,and the influence of air heat transfer coefficient on the temperature rise in the crystal is researched.Research results show that a maximum temperature rise of 70.17 ℃ and a maximum thermal distortion of 0.836 μm occur in the center of the pump face when the total pump power is 24.2 kW.These results can provide basis for the optimized design of LD-end-pumped microchip laser with back surface cooling.

关 键 词：微片激光器 热分析 空气热传导系数 狄尼级数 第三类边界条件 

分 类 号：TN248.1[电子电信—物理电子学]