Accuracy test of output wavelength of narrow linewidth laser by using F-P cavity to squeeze its linewidth

Resonator fiber gyro system requires narrow linewidth and high stable output. In order to satisfy the testing requirements of frequency deviation of resonant signal, two systems of optical frequency locking were designed and the testing platform was set up. During the experiment, the wavemeter was used to monitor the fluctuation of wavelength before and after lock frequency. For plan two, two different kinds of instrument' frequency locked parameters were set, then the accuracy of locking frequency was monitored and analyzed, it was obtained that the accuracy of locking frequency could reduce 1 times under different parameters. The testing result of two plans were same that the wavelength after locked frequency was 0.2 times than before and the curve was smooth and flat, and the fluctuation of output wavelength of laser was narrowed largely after locked the frequency and the real-time of locked feedback was improved. It provides the technical support for narrowing laser spectrum and track-locking laser frequency by PI circuit.