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由跃迁速率方程推出了三能级系统的激光阈值和斜率效率解析式．根据测试的吸收谱，计算了ＹＡＧ晶体中Ｅｒ３＋离子的吸收截面．分析了１６μｍ波长的激光特征．
The analytical solution of laser threshold and slope efficiency of three-level system is derived from the transition rate equation. According to the measured absorption spectra, the absorption cross section of Er3 + ions in YAG crystal was calculated. The laser characteristics of 1 6μm wavelength were analyzed.