LD端面抽运Nd:YVO_4温度场及热形变分析  

An investigation on temperature field and thermal induced distortion of laser diode end pumped Nd:YVO_4

作　　者：李锋[1] 高荣发[1] 张继良[1] 刘宝盈[1] 白晋涛[2] 

机构地区：[1]商洛学院物理系,陕西商洛726000 [2]西北大学光子所,陕西西安710069

出　　处：《商洛学院学报》2006年第4期5-8,共4页Journal of Shangluo University

基　　金：陕西省教育厅产业化培育项目(03JC06);陕西省教育厅专项基金项目(04JK125);(05JK185)

摘　　要：目的研究方形截面Nd:YVO4激光晶体在端面抽运情况下的温度分布及端面热形变;方法数值分析;结果得到激光晶体棒内温度场及热形变的数值解,给出了不同吸收系数下晶体中的最大温升和端面热至形变;结论吸收系数α越大,热源越向抽运端面集中,从而在端面形成一个相对集中的高温区,温度梯度分布表明晶体内具有侧向和轴向热流.端面热至形变相对于球面透镜存在高阶球差.选用较小的吸收系数有利于减小端面上的热应力和热至形变,而消除这一热效应的有效方法是采用复合晶体.Objective：To investigate temperature field and thermal induced distortion of laser diode end pumped Nd：YVO4 laser crystal.Methods：Numerical analysis.Results：Numerical solutions of temperature field for end pump configuration and thermal induced distortion of pumped end were obtained,along with the highest temperature rise and largest distortion of pump end for laser crystals with different absorption coefficient.Conclusion High absorption coefficient lead to the heat source concentrates to the pump end and thus forming a high temperature section near the pump end.Temperature gradients distribution indicates that there has lateral and axial heat flow in the crystal.Thermal induced distortion of pump end has high order spherical difference relative to a sphere lens.Smaller absorption coeffcient make for smaller thermal stress and thermal induced distortion, and availability method to eliminate these thermal effects is using composite laser crystal.

关 键 词：固体激光器 Nd:YVO4激光晶体 数值分析 温度场 LD抽运 

分 类 号：TN248.1[电子电信—物理电子学]