摘要
为减弱脉冲激光二极管巴条侧面泵浦Nd:YAG陶瓷激光器热效应影响,提高谐振腔稳定性以及改善激光器性能,文中利用热传导理论对脉冲激光二极管巴条侧泵激光陶瓷产生的温升及热形变场进行了解析研究。依据脉冲激光二极管巴条侧面泵浦激光陶瓷工作状态分析,建立契合实际的热分析模型,通过热传导Poisson方程求解,得到单脉冲侧泵激光陶瓷泵浦时段与泵浦间期两个阶段温度场与热形变场的一般解析表达式。定量地分析了脉冲二极管巴条侧面泵浦Nd:YAG陶瓷三维温场分布、重复脉冲泵浦过程中温度场分布,以及不同泵浦参数对温场的影响,定量分析了达到热动态平衡时泵浦面的热形变量。计算结果表明:当泵浦光功率为60 W,重复频率为100 Hz,束腰半径为150μm,钕离子掺杂质量分数为1.0%时,Nd:YAG陶瓷泵浦面产生29.6℃的温升,泵浦面与通光面产生0.95μm和0.99μm的热形变量。激光陶瓷温度场解析方法解决了使用数值分析法造成研究精确度不高的问题,该方法还可以应用到激光系统的其他热问题研究中,为减弱激光系统中的热问题提供了理论依据。
In order to reduce the thermal effect of Nd:YAG ceramic laser side-pumped by pulsed laser diode bar,improve the stability of resonator and improve the performance of laser,the temperature rise and thermal deformation field generated by pulsed laser diode bar side-pumped laser ceramic were studied analytically by using the heat conduction theory.Based on the analysis of the working state of the laser ceramic side-pumped by pulsed laser diode bar,a thermal analysis model suitable to the actual situation was established,and the general analytical expressions of the temperature field and thermal deformation field in the pumping period and the pumping interval were obtained by solving the Poisson equation of heat conduction.The three-dimensional temperature field distribution of Nd:YAG ceramics pumped by the side of pulsed diode bar,the temperature field distribution in the process of repeated pulse pumping,and the influence of different pumping parameters on the temperature field were analyzed quantitatively.The thermal shape variables on the pump surface were analyzed quantitatively when the thermal dynamic equilibrium was reached.Calculation results show that:when the pump power is 60 W,repetition frequency is 100 Hz,beam waist radius is 150 μm,neodymium ions doped mass fraction is 1.0%,the Nd:YAG ceramic pump surface produces temperature rise of 29.6 ℃,pump surface and smooth surface produce 0.95 μm and 0.99 μm hot shape variables.The analytical method of temperature field of laser ceramics solves the problem of low accuracy caused by numerical analysis method,and it can also be applied to other thermal problems of laser system,which provides a theoretical basis for reducing the thermal problems in laser system.
作者
李隆
张秋娟
张春玲
杨毅然
Li Long;Zhang Qiujuan;Zhang Chunling;Yang Yiran(Faculty of Science,Xi'an University of Architecture&Technology,Xi'an 710055,China;Institute for Applied Physics,Xi'an University of Architecture&Technology,Xi'an 710055,China)
出处
《红外与激光工程》
EI
CSCD
北大核心
2021年第11期148-154,共7页
Infrared and Laser Engineering
基金
国家自然科学基金(11705136)。
