Fig. 1. Structure diagram of optical path of all-fiber laser with MOPA structure

Fig. 2. Output characteristics of seed source

Fig. 3. Output characteristics of single seed source with MOPA structure

Fig. 4. MOPA laser output characteristics

Fig. 5. Spectral characteristics of MOPA laser with full-power output of amplifier pump and different input power percentage of seed source pump

Fig. 6. Typical spectrum with full-power output of amplifier pump and seed source pump input power percentage of 10%~30%