We have analyzed the characteristic features and problems in the major approaches to measurement of laser frequency noise. We propose a method in which we use an unbalanced fiber-optic interferometer, generation at the optical system output of a signal for a subcarrier of the frequency, phase-modulated by fluctuations in the laser frequency, and measurement of the spectrum for this signal. The proposed approach is distinguished by relative simplicity and accessibility, and does not require using uncommon specialized instruments and complicated specific procedures.

中文翻译：

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激光频率噪声的测量方法

我们分析了主要的测量激光频率噪声方法的特征和问题。我们提出一种使用不平衡光纤干涉仪的方法，在光学系统的输出端生成频率为副载波的信号，并通过激光频率的波动对其进行相位调制，并测量该信号的频谱。所提出的方法以相对简单和可访问性为特征，并且不需要使用不常见的专用工具和复杂的特定过程。