LD单端泵浦变热导率Nd∶YAG圆棒热容激光器温度场  

Temperature field of variable thermal-conductivity Nd ∶YAG circle heat capacity laser single-end-pumped by LD

作　　者：李隆[1] 潘晓瑞[1] 耿鹰鸽 

机构地区：[1]西安建筑科技大学理学院,陕西西安710055

出　　处：《激光与红外》2017年第11期1365-1372,共8页Laser & Infrared

基　　金：陕西省自然科学青年基础研究基金项目(No.2014JQ1008)资助

摘　　要：针对圆棒激光晶体的实际工作情况进行分析研究,以热容激光器的运行模式为依据,从经典热传导方程出发,分别建立泵浦阶段、冷却阶段的热传导模型。然后引入变热传导系数对方程进行求解,分别得到LD单端泵浦和冷却时热容激光器温度场的表达式。同时分析并对比了不同因素,如光斑半径、泵浦时间对晶体温度场的影响。计算结果表明:使用脉冲激光对晶体进行泵浦时,将Nd∶YAG晶体的热导率视为常量和变量的情况下,该晶体在泵浦端面获得的最大温升分别为164.84℃、195.58℃。此时激光光斑半径为800μm,泵浦功率为60W、超高斯阶次为3;该激光晶体的尺寸为Ф20 mm×10 mm,掺钕离子为1.0 at%,吸收系数是0.91 mm^(-1)。计算分析结果对LD泵浦固体热容激光器谐振腔的设计具有借鉴意义。Aiming at the actual working situation of circle laser crystal, according to the management mode of the circleheat capacity laser, the thermal conduction models of the pump phase and the cooling phase were established respec-tively based on the classic thermal conduction equation. Then the variable heat conduction coefficient is introduced tosolve the equation, and the expressions of the temperature fields are obtained at single-end pump phase and coolingphase. And the influences of different spot radius and pump time on the crystal temperature field are analyzed. The re-suits show that when the pump power is 60 W, the spot radius is 800 ~m and the super-Gaussian order is 3,the ther-mal conductivity of Nd ： YAG crystal is regarded as constant and variable, the maximum temperature rise of the crystalis 164. 84 ~C ,195.58 ~C at the pump end. The laser crystal has a size of q^20 mm x 10 mm,and has an absorption co-efficient of 0. 91 mm-1 for the incident pump light and 1.0 at% for the neodymium-doped ion. The calculated resultsare helpful to the optimization design and experimental study of LD pumped solid-state lasers.

关 键 词：圆棒热容激光器 变热导率 温度场 激光器 

分 类 号：TN248.1[电子电信—物理电子学]