理论研究了LD端面泵浦全固态连续单纵模3 μm激光器的输出特性。基于对Er:YAG激光器的能量过程的分析,建立了考虑晶体热效应影响的速率方程模型,讨论了晶体控温温度、掺杂浓度、晶体长度、泵浦-振荡激光模式匹配比率、输出镜透射率、单向器插入损耗等参数对连续单纵模3 μm激光输出特性的影响,为高功率连续单纵模3 μm激光光源的设计和优化提供了理论依据。

The output characteristics of LD end-pumped single-longitudinal-mode (SLM) 3 μm lasers are studied theoretically.Based on the analysis of energy processes of the Er:YAG laser system,a rate equation model with the influences of thermal effect taken into account is established,and the effects of the temperature and doping concentration and length of the laser crystal,the pump waist to laser waist ratio,the transmission of output coupler,the insertion loss of the optical diode on the output behaviors of the continuous wave (CW) SLM 3 μm laser are researched.The model can be used to guide the design and optimization of a high power CW SLM Er:YAG laser operating at 3 μm.