利用输出功率测量激光二极管端面抽运的固体激光器热透镜焦距

Meassurement of the laser diode end-pumped solid laser’s thermal focal length by using the curve of output

运用谐振腔变换圆理论 ,详细分析了激光二极管抽运的Nd :YVO4 平行平面腔固体激光器振荡光在晶体内的基模光斑半径随抽运功率变化的U形曲线 .提出在适当腔长情况下激光器的输出功率随抽运功率变化曲线上将出现凹陷或尖峰现象 ,利用曲线上的凹陷和尖峰可以测量激光晶体的热透镜焦距 .同时在理论分析的基础上进行了实验 ,实验结果与理论分析相符合 .

A, U-like shape on the curve of fundamental-mode waist in the active medium versus pump power, at different cavity lengths of the laser diode (LD) end-pumped Nd:YVO4 solid-state lasers with a flat-flat resonator structure, is analyzed by means of the transform circle approach. There are caves and pinnacles on the curve at appropriate cavity lengths. Utilizing the caves and pinnacles, a new method is put forward to determine the focal length of thermal tens. Based on the theoretical analysis, we have designed a laser and obtained some experimental results that are consistent with the theoretical expectations.