Fig. 1. Schematic diagram of irradiation performance experiment of fiber lasers

Fig. 2. Schematic diagram of 976 nm and 915-nm-pumped fiber lasers

Fig. 3. (a) Comparison of 915 nm and 976 nm-pumped fiber lasers output power after irradiation; (b) fiber laser irradiation loss in unit active fiber length, the illustration is an enlarged view

Fig. 4. (a) Comparison of output powers before and after irradiation; (b) output spectral data of the fiber laser

Fig. 5. (a) Comparison of coupling efficiency of fiber combiner before and after irradiation; (b) comparison of cladding light stripping of fiber stripper before and after irradiation