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针对脉冲激光二极管端面泵浦Nd:YAG圆棒晶体产生的热效应问题,考虑到导热系数与温度的函数关系,建立了端面绝热、周边恒温的晶体热模型,运用解析方法计算出Nd:YAG圆棒晶体温场分布。通过对激光晶体工作特点的分析,引入弦截法,得到变热传导系数Nd:YAG圆棒晶体的温场分布表达式。不仅定量分析了在不同脉冲宽度和光斑半径下Nd:YAG圆棒晶体内部温场时变情况,而且也计算了非稳态及准热平衡态时Nd:YAG圆棒晶体的温度场。计算结果表明,使用输出功率为60 W,脉冲频率为100Hz,脉宽为2ms的三阶超高斯光泵浦Nd:YAG圆棒晶体端面,则尺寸为φ4×8mm3的Nd:YAG的圆棒晶体在达到准热平衡状态时,晶体内部最高温和最低温分别为369.1K和340.5K。研究结果为如何减小激光晶体热效应提供了一定的参考价值。
In view of the thermal effect caused by pulsed laser diode end-pumped Nd: YAG rod-shaped crystals, considering the thermal conductivity as a function of temperature, a crystal thermal model with end-face adiabatic and peripheral constant temperature was established. The Nd: YAG rod Crystal temperature field distribution. By analyzing the working characteristics of the laser crystal, the chord-cut method is introduced to obtain the temperature field distribution expression of the Nd: YAG rod-shaped crystal. The temperature field of the Nd: YAG rod is not only quantitatively analyzed, but also the temperature field of the Nd: YAG rod is calculated at different pulse width and spot radius. The calculated results show that Nd: YAG round rod crystal with φ4 × 8mm3 size is pumped by the third-order super-Gaussian optical pump with output power of 60 W, pulse frequency of 100 Hz and pulse width of 2 ms When the quasi-thermal equilibrium state is reached, the maximum and minimum temperatures inside the crystal are 369.1K and 340.5K, respectively. The results provide some reference value for how to reduce the thermal effect of laser crystal.