脉冲激光二极管泵浦调Q激光器泵浦时间特性研究

从调Q激光器的速率方程出发,对脉冲激光二极管泵浦的调Q激光器在不同泵浦功率及不同透过率情况下的最佳泵浦时间进行了理论分析。计算结果表明,在透过率为20%,腔内损耗为0.05的条件下,1—3倍阈值泵浦功率时,最高效率对应的最佳泵浦时间为1—1.5倍Nd∶YAG荧光寿命;7倍阈值泵浦功率及以上时,最佳泵浦时间约为荧光寿命的一半或者更短。在脉冲泵浦能量相同时,采用较短的泵浦时间(即泵浦功率较高),调Q输出的能量转换效率较高。

Optimizaton of pumping pulse duration for a pulsed diode pumped q-switched laser

Based on the theory of rate equations for a pulsed diode pumped Qswitched laser,optimum pumping pulse duration is analysed theoretically by taking account of pump power level,output mirror transmission and intracavity loss in Q-switched laser.The results show that,when the transmission of output mirror is 20%,the intracavity loss is 0.05,the optimum pumping duration is 1-1.5 times fluorescence lifetime of Nd∶YAG at the pump power level is 1-3 times of the threshold power;the optimum pumping duration is about half the fluorescence lifetime or even less,when the pump power is more than 7 times threshold power.At the same pumping pulse energy level,the higher energy conversion efficiency can be obtained at the shorter pump duration(that is the higher pump power).