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本文报导了相位共轭反馈He－Ne激光器的噪声特性，观测到激光起伏存在两种变化过程，即几十赫兹的快变过程和秒量级的慢变过程，在远离半腔长整数倍处，相位共轭反馈只影响其激光器本征噪声的周期性，其噪声幅度变化较小，在一倍腔长处，噪声起伏约为激光输出的35％．
This paper reports the noise characteristics of the phase conjugate feedback He-Ne laser. There are two kinds of changes in the laser fluctuation, namely the rapid change of tens of hertz and the slow change of the second order. The phase conjugate feedback only affects the periodicity of the laser intrinsic noise, and its noise amplitude changes little. At one cavity length, the noise fluctuation is about 35% of the laser output.