利用准三能级理论，建立了端面泵浦Ho∶YAG激光器阈值理论模型，推导出Ho激光阈值泵浦功率表达式，并分析了阈值泵浦功率与介质吸收效率、输出镜透过率的关系.结果表明：Ho∶YAG激光器属于低阈值激光器，合理选择激光器参量，采用1 907 nm泵浦或1 930 nm“翼泵浦”方式，可使Ho激光阈值泵浦功率处于毫瓦级水平；选择合适透过率的输出耦合镜，可实现Ho∶YAG激光输出波长在2 092 nm和2 124 nm之间转换.

Based on the theory of quasi-three-level, a model of threshold pump power of Ho∶YAG laser was built and the formula of threshold pump power of Ho laser was derived. The relationship between the threshold pump power and the absorption efficiency of gain medium or the transmission of output coupler was analyzed. The mW-level threshold pump power of Ho laser can be obtained by optimizing parameters of Ho laser, which was pumped at 1 907 nm or wing-pumped at 1 930 nm. Furthermore, center wavelength lasing at 2 092 nm or 2 124 nm should be achievable by choosing an output coupler of suitable transmission.