提出了一种利用弛豫振荡频率测量单频激光器腔内损耗的简单方法。通过对单频激光器的弛豫振荡频率，输出功率以及腔内损耗之间关系的分析，理论得到了单频激光器腔内损耗的表达式；通过在实验上测量单频钛宝石激光器的输出功率和相应功率下的弛豫振荡频率，利用理论计算公式以及钛宝石激光器的相关参数即可获得激光器的腔内损耗值。

A simple method to measure the intracavity losses of the single frequency laser utilizing the resonant relaxation oscillation (RRO) frequency and output power is presented. By analyzing the dependence of the RRO frequency on the output power, the theoretical function of the intracavity losses is presented. Substituting the measured output power and RRO of the single frequency Ti:sapphire laser into the theoretical function, its intracavity losses is obtained.