Narrow Linewidth Fiber Laser Based on Nanoparticles Doped Self-injection Module

Fiber lasers with narrow linewidth are essential light sources for many prospects in advanced scientific fields. In this article, we propose a scheme of self-injection locked single-frequency fiber laser based on a hybrid cavity configuration and a novel type of nanoparticles doped fiber to achieve narrow linewidth output. Experimental study and measurement analysis of key performance parameters have been carried out, including linewidth, optical spectral and noise characteristics. The single frequency performance has been verified with > 60 dB side mode suppression ratio. A 556 Hz 3dB linewidth has been achieved, with better frequency noise performance compared with a typically high quality commercial laser source.