High power dual-wavelength fiber laser output assisted by cascade single-stage resonant cavity

Dual-wavelength fiber lasers (DWFL) hold broad promise for industrial, sensing, telecommunications, and biomedical fields due to their flexible dual-wavelength emission.In this work, a DWFL architecture was numerically modeled and systematically optimized to enhance output performance.Simulation results indicated that optimizing pump power distribution, the length of the ytterbium-doped fiber and the wavelength combination can significantly improve the output characteristics.Furthermore, the incorporation of a chirped and tilted fiber Bragg grating and wider fiber Bragg gratings yield a 2.5-fold power enhancement.Guided by theoretical and experimental analysis, an output power of 31 W at 1060 nm wavelength and 840 W at 1080 nm wavelength was achieved with a signal-tonoise ratio of 32 dB.To the best of our knowledge, these represent the highest output powers reported for a DWFL to date.Our work provides valuable design insights for the development of compact, high-power DWFL systems.