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窄线宽激光器随机发生的跳模现象,是影响光学系统稳定的重要因素。激光器线宽窄往往意味着较长的谐振腔和较小的模间隔,从而给跳模的监测带来了难度。本文提出一种基于非平衡光纤干涉仪的窄线宽光源跳模测试方法,该方法将激光器跳模的频率变化转变为干涉仪的相位变化,并通过相位产生载波(PGC)调制解调技术来检测相位信息,从而实现对跳模过程的监测。该方法灵敏度高,能够长时间连续监控,测试效果优于Fabry-Perot干涉仪,还可在kHz量级上测量窄线宽激光器的线宽,为单纵模窄线宽激光器研究提供有效的测试手段。
The phenomenon of mode hopping occurring in narrow linewidth lasers is an important factor that affects the stability of the optical system. Lasers, which are often narrow lines, mean longer resonators and smaller die spacings, which makes it difficult to monitor jump mode. In this paper, we propose a new mode hopping mode test for narrow linewidth light source based on unbalanced fiber optic interferometer. This method transforms the frequency change of the laser mode hopping into the phase change of the interferometer. Through phase modulation (PGC) modulation and demodulation Detection phase information, in order to achieve the jump mode monitoring process. The proposed method is sensitive and can be continuously monitored over a long period of time. This method is superior to the Fabry-Perot interferometer and can measure the linewidth of a narrow-linewidth laser on the order of kHz, providing an effective test for single- means.