Abstract In this study, to measure the frequency drift characteristics of the narrow-linewidth laser, we provide a method with high accuracy and adjustable measuring range that can be applied in a resonant optical gyro (ROG) system. In an ROG system, the laser frequency drift characteristics, such as fluctuation range and frequency, influence the performance of the closed-loop frequency-locked module. To measure the above performance of the laser, we proposed a novel measurement system based on the Fabry–Perot cavity. We proved the feasibility of the scheme through theory and simulation. Then, the calibration of the experimental device and the measurement of the tested laser were completed. The measurement accuracy of this method is 1.2 kHz, and the measurement range reaches ±60 MHz, which can be adjusted by the modulation index. The results show that the laser has a frequency fluctuation of 30 MHz in the stabilization stage, and there is mainly a low-frequency component under 5 Hz in the frequency domain of the laser frequency fluctuation. Furthermore, this measurement scheme can be applied in other fiber sensor systems to evaluate the effect of laser frequency fluctuation on system output performance.

中文翻译：

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谐振光学陀螺窄线宽激光器频率稳定性研究

摘要 在本研究中，为测量窄线宽激光器的频率漂移特性，我们提供了一种高精度、量程可调的方法，可应用于谐振光学陀螺（ROG）系统。在 ROG 系统中，激光频率漂移特性，如波动范围和频率，会影响闭环锁频模块的性能。为了测量激光器的上述性能，我们提出了一种基于法布里-珀罗腔的新型测量系统。我们通过理论和仿真证明了该方案的可行性。然后，完成了实验装置的校准和被测激光的测量。该方法的测量精度为1.2 kHz，测量范围达到±60 MHz，可通过调制指数进行调整。结果表明，激光器在稳定阶段有30 MHz的频率波动，在激光频率波动的频域中主要存在5 Hz以下的低频成分。此外，该测量方案可应用于其他光纤传感器系统，以评估激光频率波动对系统输出性能的影响。