Ho:YAG 晶体因其优良的机械性能及光谱特性，成为高重频2 μm 激光器的可选晶体之一。为获得高效率、高功率、高重频2 μm Ho:YAG 激光器，分析了单掺Ho3+激光器的发光机理，从速率方程出发建立了高重频Ho:YAG 激光器转换效率的计算模型，利用该模型分析了输出镜透射率、激光模式大小、抽运-激光模式比和离子掺杂浓度等参数对高重频Ho:YAG 激光器转换效率的影响，并提出了参数设计范围，通过实验对理论模拟结果进行了验证。

With good machine performance and spectrum characteristic, Ho:YAG crystal has become one of the choices for high-repetition-frequency 2 μm laser. In order to acquire high efficiency and high power 2 μm Ho:YAG laser with high-repetition-frequency, radiation mechanism of singly-doped Ho3 + laser are analyzed. And the calculation model of conversion efficiency in high-repetition-frequency Ho:YAG laser is established through rate equation. The effects of the parameters such as output coupler transmittance, laser mode size, ratio of pump-laser mode and Ho-doping atomic number fraction, on the conversion efficiency in high-repetition-frequency Ho:YAG laser are analyzed by this calculation model. The design scope of those parameters is also put forward. The theoretical simulation results are verified through experiments.