报道了采用光纤耦合激光二极管(LD)模块端面抽运Nd:YVO4晶体实现高功率、高重复频率声光调Q 1342 nm波长的激光输出,以及采用考虑增益频谱分布的调Q速率方程模型仿真研究该脉冲激光器的结果。在激光器注入总功率40 W的情况下,可得到最高工作重复频率100 kHz;在50 kHz重复频率工作条件下,可得到11.0 W的平均输出功率及稳定的脉冲输出。应用与介质增益频谱相关的调Q速率方程模型对该脉冲激光器进行了仿真研究,得到了脉冲宽度、脉冲峰值功率、脉冲建立时间等计算结果,还给出了输出在频谱上的分布以及谱宽,并与实验结果进行了比较。考虑增益频谱分布的调Q速率方程模型不仅可以应用于分析、设计脉冲激光器的频谱,而且由于考虑了增益在频谱上的实际分布,基于该模型的仿真计算可以获得比传统单频调Q速率方程更为接近实际的结果。

A high-power high-repetition-rate acousto-optically Q-switched 1342 nm laser with double Nd:YVO4 crystals pumped by fiber-coupled laser diodes and simulated results based on Q-switched rate equations considering gain distribution on spectrum are presented. With total 40 W pump power incidence, the highest pulse repetition rate of 100 kHz was obtained. At 50 kHz repetition rate, average output power higher than 11 W and rather stable pulses were achieved. With the Q-switched rate equations considering gain distribution on spectrum, not only the pulse width, peak power and build-up time can be calculated, but the output distribution on the spectrum and its width can also be given. The experimental results are compared with the simulated ones. The model can be applied to analyze and design the spectrum of the laser output, and more exact results can be obtained because the practical gain distribution on the spectrum was taken into consideration.