激光二极管侧抽运长方形Nd:YVO_4激光晶体热分析  

Thermal Analysis of Rectangular Nd:YVO_4 Crystal by Laser Diode Side-Pumped

作　　者：史彭[1] 李隆[1] 甘安生[1] 

机构地区：[1]西安建筑科技大学理学院

出　　处：《中国激光》2007年第2期176-180,共5页Chinese Journal of Lasers

基　　金：陕西省教育厅专项科研项目(06JK251)资助课题

摘　　要：以解析分析理论为基础,研究长方形Nd∶YVO4激光晶体受到具有高斯分布半导体激光侧端面抽运时,晶体温度场和热形变的分布情况。通过对激光二极管(LD)侧面抽运晶体工作特点分析,建立了符合实际工作情况的热模型,利用正交各向异性材料热传导方程,得出长方形Nd∶YVO4晶体温度场和热形变场通解表达式,并提出了两种有效减小晶体热形变的方法。研究结果表明,当使用输出功率为30 W的激光二极管侧面中心抽运Nd∶YVO4激光晶体时,在抽运端面中心获得240.0℃最高温升和4.73μm最大热形变量。偏心0.6 mm时,端面最大热形变量减少31.1%。晶体厚度减小30%时,端面最大热形变量减少23.5%。Based on analytical theory, the temperature field and the pumped-face thermal distortion of a rectangular Nd：YVO4 laser crystal side-pumped by a diode laser with Gaussian distribution were investigated. By analyzing the working characteristics of the laser diode （LD） side-pumped crystal, thermal physical model according with actual working conditions was built, the general expressions of temperature field and thermal distortion field of rectangular Nd： YVO4 crystal were obtained by using a new solution in heat conduction equation of orthogonal anisotropic material. Two methods of effectively reducing thermal distortion were presented. The research results showed that the maximum temperature rise of 240.0 ℃ and the maximum thermal distortion of 4.73 μm can be obtained in the center of the pump side-surface when the output power of the diode laser is 30 W. If eccentric pump center is 0.6 mm, the maximum thermal distortion is reduced by 31.3 %. And if the thickness of crystal is reduced by 30%, the maximum thermal distortion is reduced by 23.5 %.

关 键 词：激光器 Nd:YVO4激光晶体 长方形激光晶体 温度场 热形变场 泊松方程 

分 类 号：TN248.1[电子电信—物理电子学]