脉冲激光二极管双端抽运Tm:YAG棒瞬态热效应分析  

Pulsed Laser Diode Dual-End Pumped Tm:YAG Rod Transient Thermal Effect Analysis

作　　者：金光勇[1] 吴婧[1] 吴春婷[1] 范二赫 王超[1] 陈薪羽[1] 于永吉[1] 谭雪春[1] 

机构地区：[1]长春理工大学理学院固体激光技术与应用重点实验室,吉林长春130022

出　　处：《中国激光》2013年第10期6-11,共6页Chinese Journal of Lasers

基　　金：吉林省科学技术厅基金(201201113)

摘　　要：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 transient heat conduction equation, pulse Gaussian beam dual-end pumped Tm： YAG rod time- varying temperature field analytical expression and the time-varying thermal focal length are obtained by the integral transform method. The effects of pumping power, repetition frequency and duty ratio on pulse laser diode dual-end pumped Tm： YAG rod axial transient temperature distribution and the time-varying thermal focal length are quantitatively analysed. Simulation results show that with the increase of pulse number, the temperature distribution and the thermal focal length of Tm： YAG crystal rod appear jagged and eventually get to the periodic distributions. As the increase of pumping power, repetition rate and duty ratio, the whole temperature of Tm： YAG crystal rod increases and the temperature difference between the Tm： YAG rod on both ends of the center and the axis center of rod becomes larger, while the time-varying thermal focal length gradually becomes shorter and the fluctuation range is smaller. The results provide theoretical basis for the further study of heating compensation and cavity design.

关 键 词：激光器 脉冲单掺铥固体激光器 解析分析 瞬态热效应 双端抽运 

分 类 号：TN248.1[电子电信—物理电子学]