One KHz-Order Linewidth-Stabilized Ring-Cavity Fiber Laser Based on Sub-Ring Cavities and Saturable Absorber Hybrid Scheme

This study demonstrates a narrow linewidth-stabilized ring-cavity fiber laser uses three sub-ring cavities and fiber saturable absorber. The measured laser output power and wavelength change are less than 0.03dB and 0.008nm within 60minutes, respectively. A narrow linewidth of 1.65KHz with and a high optical-signal-to-noise-ratio of 62dB is obtained.