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在高功率激光二极管(LD)抽运条件下,固体增益介质的热透镜效应是优化激光谐振腔系统所必须考虑的重要因素之一。利用带尾纤耦合输出的激光二极管和整形聚焦透镜组组合抽运Nd:YVO4晶体,用稳腔法测量了激光晶体的等效热焦距。利用LAS-CAD软件模拟了三种热稳腔结构在所测等效热焦距下的模式分布,对LD双端抽运Nd:YVO4激光器Z字型谐振腔进行优化设计后,实验选定后腔镜曲率半径R1=300mm,输出镜曲率半径R2=100mm,腔长Ltotal=280mm,耦合输出镜透射率T=50%。当输入61W抽运功率时,激光最高输出功率达21.3W,光束质量因子M2<1.41,所得激光器输出结果与理论预期吻合得很好。
The thermal lensing of a solid gain medium is one of the important factors that must be considered in optimizing a laser cavity system under high power laser diode (LD) pumping conditions. The Nd: YVO4 crystal was pumped by a combination of a laser diode with a pigtail-coupled output and a shaping and focusing lens, and the equivalent thermal focal length of the laser crystal was measured by a stable cavity method. The LAS-CAD software was used to simulate the mode distribution of three kinds of thermostable cavity structures under the measured thermal focal length. After optimized design of the Z-type cavity of LD double-ended pumped Nd: YVO4 laser, Mirror radius of curvature R1 = 300mm, output mirror radius of curvature R2 = 100mm, cavity length Ltotal = 280mm, coupling output mirror transmittance T = 50%. When 61W pumping power is input, the maximum output power of the laser reaches 21.3W and the beam quality factor M2 <1.41. The obtained laser output agrees well with the theoretical prediction.