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研究了输出波长为2.018μm的激光二极管(LD)抽运Tm∶YAG激光器。通过准三能级系统的速率方程,分析了激光系统的抽运阈值和斜率效率。同时,利用ABCD矩阵分析了平凹腔和双凹腔的腔型稳定条件和模式匹配情况。实验时采用785 nm的光纤耦合半导体激光器为抽运源,当采用平凹直腔,Tm∶YAG晶体为5℃时,获得了4.04 W的连续激光输出,激光器斜率效率为35.4%,光-光转换效率为26.4%。实验比较了不同晶体温度下Tm∶YAG激光器的阈值、功率和效率。实验结果与理论分析基本吻合。此外,还研究了激光器腔型对激光输出功率和效率的影响。
A laser diode (LD) pumping Tm: YAG laser with an output wavelength of 2.018 μm was studied. The pumping threshold and slope efficiency of the laser system are analyzed by the quasi-three-level rate equation. At the same time, the cavity shape stability and mode matching of flat cavity and double cavity were analyzed by ABCD matrix. When using 785 nm fiber-coupled semiconductor laser as the pumping source, a continuous laser output of 4.04 W was obtained when the Tm: YAG crystal was 5 ° C using a plano-concave cavity and the slope efficiency of the laser was 35.4% Conversion efficiency of 26.4%. The experiment compares the threshold, power and efficiency of Tm: YAG lasers at different crystal temperatures. The experimental results are in good agreement with the theoretical analysis. In addition, the influence of laser cavity on laser output power and efficiency was also studied.