双端泵浦Nd:YVO4晶体温度场及热形变场的研究

为了研究激光二极管双端泵浦激光晶体引起的热效应问题,建立了轴向加热、周边恒温的圆柱形激光晶体热模型.通过热传导方程,利用半解析方法得出了双端泵浦激光晶体温度场和端面热形变场的通解形式,同时研究了泵浦功率、泵浦光斑尺寸以及晶体钕离子掺杂质量分数等因素对晶体温度场和端面热形变场的影响.研究结果表明:当泵浦功率增加、光斑尺寸减小、钕离子掺杂质量分数增加时,激光晶体端面处的温升和热形变量也相应地增大;在相同泵浦条件下,钕离子掺杂质量分数为 0 5%的掺钕钒酸钇晶体中截面处的温升大于其他掺杂质量分数的晶体的相应温升.

Temperature Field and Thermal Distortion Field of Nd:YVO4 Crystal with Double-Ends Pumping

In order to research the thermal effect problem incurred by diode lasers double-end pumped laser crystal, a thermal model of axially heated cylindrical laser crystal with a fixed boundary temperature was built. Based on the heat conduct equation, the general solutions of laser crystal temperature field and pump-face thermal distortion field were obtained by the semi-analytical solution. Some factors, such as pump power, pump spot size and crystal Nd-ion doped quality index, which influence on the crystal temperature field and pump-face thermal distortion field, were analyzed. The result shows that when increasing the pump powers, reducing the size of pump spot and adding Nd-ion doped quality index, the temperature raise and the thermal distortion of pump-face will all be increased. With the same pump conditions, the medial section temperature raise of 0.5%(mass fraction) Nd-ion doped neodymium-doped yttrium orthovanadate crystal is higher than other doped quality index.