摘要
在全固态激光器中使用了复合结构的激光晶体,通过端面泵浦复合晶体工作特点分析,提出了矩形截面复合晶体热分析模型。在热模型中,考虑了复合晶体具有轴向加热、周边恒温,耦合后的泵浦光束具有高斯分布的特点。利用热传导方程,得出了YVO4-Nd∶YVO4复合晶体内部温度场及端面热形变的一般解析表达式。研究结果表明,若用输出功率为20 W的激光二极管端面泵浦YVO4-Nd∶YVO4复合晶体(其中复合晶体中YVO4晶体长为2 mm,Nd∶YVO4晶体长为6 mm,钕离子掺杂质量分数为0.5%),泵浦光斑为0.2 mm时,复合晶体内最大温升为324.5℃,泵浦端面具有3.61 mm的热形变量。在相同泵浦条件下,采用复合晶体替代Nd∶YVO4晶体,可将其最大温升降低23.4%,这对于消弱激光晶体热效应的影响,解决激光二极管端面泵浦激光晶体引起的非均匀温升以及热折裂问题,提高激光器性能有着重要的意义。
Through characteristic analysis of composite laser crystal, a thermal analysis model of rectangle composite crystal was introduced. In the thermal model, the composite crystal was characterized by axially symmetrical heating, fixed boundary temperature and coupled pump laser having Gaussian distribution. Based on the heat conductive equation and its boundary, the analytical solutions of interior temperature field and thermal deformation of YVO4-Nd ： YVO4 composite crystal were obtained. The result shows that when the end-pumped power of diode laser is 20 W and the diameter of pump spot is 0.2 mm, the maximal temperature rise of YVO4-Nd： YVO4 composite crystal（the length of YVO4 crystal is 2 mm , the length of Nd ＂ YVO4 crystal is 6 mm and the neodymium doped concentration in Nd ： YVO4 crystal is 0. 5 %） is 324.5℃, and thermal distortion on pump-face of composite crystal is 3.61 mm. Under the same pumped conditions, the maximal temperature rise is decreased by 23.4% using the composite crystal instead of Nd effect influence of laser crystal and improve laser nonuniform temperature rise and thermal fracture end-pumped. ＂ YVO4 crystal. This means it can reduce thermal effect influence of laser crystal and improve laser characteristics and performance, and also can solve nonuniform temperature rise and thermal fracture problems of laser crystal by high power diode laser end-pumped.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2006年第5期786-791,共6页
Optics and Precision Engineering
基金
陕西省教育厅专项科研项目(No:06JK251)
校基金资助
