Fig. 1. Schematic of spectral combining based on reflective diffraction grating

Fig. 2. Structure of all-fiber MOPA with wavelengths of 1064 nm and 1080 nm

Fig. 3. Schematic of optical system for double-beam spectral combining

Fig. 4. Relationship among combined power, combined efficiency and total power of two laser sources

Fig. 5. Combined spectrum when total power is 13.64 W

Fig. 6. Measurement results of beam profile and beam quality of sub-beam array and combined beam