论文部分内容阅读
基于瞬态热传导方程,通过积分变换方法求解得到脉冲高斯光束双端抽运Tm:YAG棒的时变温度场解析表达式,进而求得时变热焦距。同时定量模拟,分析了不同抽运功率、重复频率与占空比对脉冲激光二极管双端抽运Tm:YAG棒轴向瞬态温度分布和时变热焦距的影响。模拟结果表明:随着脉冲抽运个数的增加,Tm:YAG晶体棒内温度和热焦距整体均呈锯齿状分布,并最终趋于稳定的周期性分布;随着抽运功率、重复频率与占空比的增加,Tm:YAG晶体棒整体温度升高,且棒两端面中心点与棒轴向中心点温差增大,而时变热焦距整体逐渐变短且波动范围变小。研究成果为进一步研究热效应补偿和谐振腔设计提供了理论依据。
Based on the transient heat conduction equation, the time-varying thermal field of the Tm: YAG rod is solved by the integral transform method. At the same time, the effects of different pumping power, repetition frequency and duty cycle on the axial transient temperature distribution and the time-varying thermal focal length of Tm: YAG rod are analyzed. The simulation results show that the temperature and thermal focal length of the Tm: YAG crystal are distributed in a jagged manner as the number of pulse pumping increases, and finally tends to a stable periodic distribution. With the pumping power, the repetition frequency and As the duty ratio increases, the overall temperature of the Tm: YAG crystal rod increases, and the temperature difference between the central point of the two end faces of the rod and the axial center of the rod increases, while the time-varying thermal focal length becomes gradually shorter and the fluctuation range becomes smaller. The research results provide a theoretical basis for further research on thermal compensation and resonant cavity design.