双端抽运矩形截面Nd:GdVO_4晶体热效应研究

Thermal effect of doudle-end-pumped rectangle Nd:GdVO_4 crystal

以解析分析为基础,研究矩形横截面Nd:GdVO4晶体受高斯分布激光双端面中心入射时温度场以及抽运面热形变分布情况.通过对半导体激光双端面泵浦Nd:GdVO4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,并利用热传导方程新的求解方法,得出晶体的温度场分布和端面热形变场通解表达式,同时对影响激光晶体温度场分布各种因素进行了定量研究.研究结果表明:当使用输出功率为15 W半导体激光器双端面中心入射时,在抽运端面中心获得214.8℃最高温升和2.73μm最大热形变量.这种方法还可以应用到其他激光晶体热问题研究中,为解决激光系统热问题提供了理论依据.

Based on the analytic analysis, temperature field and pumped-face thermal distortion field of a rectangle Nd：GdVO4 crystal double-end-pumped by lasers having Gaussian intensity distribution are researched. Through diode lasers double-end-pumped Nd：GdVO4 laser work characteristic analysis, a thermal physical mode of laser crystal according to actual state was built, a new solution of heat conduction equation was introduced, and the general expression of a rectangle Nd：GdVO4 crystal interior temperature field and thermal distortion field of pumped-face were obtained. Some relevant parameters influencing laser crystal temperature field distribution, were put to quantitative analysis. The result shows that when the output power of diode laser is 15W, the maximal temperature rise is 214.8℃, and the maximal thermal distortion of pump-face is 2.73 m. This method can also be applied to analyze thermal problems of other laser crystals and will be theoretically established for resolving the thermal problem in laser systems.