各向异性热参量对Nd:YVO_4晶体热效应的影响  

Influence of Anisotropic Thermal Parameter on the Thermal Effect of Nd:YVO_4 Crystal

作　　者：史彭[1] 李隆[1] 陈文[1] 甘安生[1] 

机构地区：[1]西安建筑科技大学理学院,陕西西安710055

出　　处：《光电子．激光》2007年第2期175-178,共4页Journal of Optoelectronics·Laser

基　　金：陕西省教育厅专项科研资助项目(06JK251)

摘　　要：基于解析各向异性分析理论,研究了矩形横截面Nd:YVO4激光晶体受到具有高斯分布LD端面抽运时的激光晶体温度场分布和抽运面热形变分布。通过LD抽运Nd:YVO4激光晶体工作特点分析,建立了符合激光晶体工作状态的热模型,利用各向异性介质热传导方程的一种求解方法,得出了矩形截面Nd:YVO4晶体的温度场、热应变场和端面热形变场的通解表达式,分析了各向异性热参量对Nd:YVO4激光晶体热应变场的定量影响。研究结果表明:当使用输出功率为15WLD端面中心入射Nd:YVO4晶体(Nd3+浓度0.5atm%)时,在抽运端面中心获得244.9℃最高温升和1.99μm最大热形变量。Based on the analytical theory of aeolotropy, the thermal distortion of pumped-face and the temperature field distribution of laser crystal are investigated when Nd：YVO4 crystal with rectangular eros section is end-pumped by a laser beam of Gaussian distribution from a diode laser. A thermal model that accords with the working state of the Nd： YVO4 laser crystal is established. By using a new solution to the heat conduction equation of the anisotropic medium,general solution expressionis of the temperature field,the thermal strain field and the thermal distortion field of Nd：YVO4 crystal with rectangular cross section are obtained. The quantitiative effect of the anisotropic thermal parameters on the thermal strain field of Nd： YVO4 laser crystal is analyzed. The research results show that the maximum temperature rise of 244.9 ℃ and the maximum thermal distortion of 1.99μm can be obtained in the center of the pumped end surface when the Nd：YVO4 laser crystal is pumped by a diode laser with a output power of 15 W from the center of end face （the weight percent of neodymium ion doped in the crystal equals 0.5%）. This method can also be applied to the research on other thermal problems of laser crystal and offer the theoretical basis to effectively solve the thermal problems in laser system.

关 键 词：激光物理 Nd:YVO4激光器热分析 解析理论 矩形截面 各向异性 

分 类 号：TN248.1[电子电信—物理电子学]