脉冲LD端面抽运变热导率方片Yb:YAG晶体温度场  

Temperature Field of Pulsed LD End-Pumped Square Yb:YAG Crystal with Variable Thermal-Conductivity

作　　者：耿鹰鸽 李隆[2] 潘晓瑞[1] 傅依柳 

机构地区：[1]西安建筑科技大学理学院,陕西西安710055 [2]西安建筑科技大学应用物理研究所,陕西西安710055

出　　处：《激光与光电子学进展》2016年第8期161-168,共8页Laser & Optoelectronics Progress

基　　金：陕西省自然科学青年基础研究基金(2014JQ1008)

摘　　要：对脉冲激光二极管(LD)端面抽运变热导率方片Yb:YAG晶体的温度场进行了分析和研究,建立了端面绝热、周边恒温的热传导模型,采用半解析理论,结合牛顿法得到了晶体的温度场分布,分析了不同的抽运功率、超高斯阶次、光斑半径和晶体尺寸因素对晶体温度场的影响。计算结果表明,当采用抽运功率为80 W、超高斯半径为400μm、超高斯阶次为3的脉冲激光二极管对晶体进行抽运时,在将Yb:YAG晶体的热导率分别视为常量和非常量的情况下,该晶体在抽运端面处获得的最大温升分别为31.69,35.66℃。研究结果为激光器的设计提供了一定的理论指导。The temperature field of a pulsed laser diode （LD） end-pumped Yb： YAG crystal with variable thermal conductivity is studied. A thermal conduction model with heat-insulted end faces and constant peripheral temperature is built. Based on the semi-analytical theory and by means of Newton＇s method, the temperature field distribution of the crystal is obtained. The influences of pump power, super-Gaussian order, spot radius, and crystal size on the temperature field are analyzed. The calculation results show that, when the crystal is pumped by a pulsed LD with super-Gaussian order of three, pump power of 80 W, and radius of 400 μm, and under the condition that the thermal-conductivity is constant or non-constant, the maximum temperature increase at the pumped end faces is 31.69 and 35.66℃, respectively. The research results provide certain theoretical guidance to the design of lasers.

关 键 词：激光技术 方片Yb:YAG晶体 变热导率 温度场 激光器 

分 类 号：TN248.1[电子电信—物理电子学]