Fig. 1. Schematic layout of external cavity SBC system

Fig. 2. Schematic layout of SBC system after optimization

Fig. 3. Schematic layout of SBC system

Fig. 4. Schematic of propagation route of laser sub-beams

Fig. 5. Beam quality measurement of the SBC. (a) Horizontal direction; (b) vertical direction

Fig. 6. Beam quality measurement of 1060 nm laser. (a) Horizontal direction; (b) vertical direction

Fig. 7. Beam quality measurement of 1080 nm laser. (a) Horizontal direction; (b) vertical direction

Fig. 8. Spectra of (a) two sub-beams on free running and (b) after SBC

Fig. 9. Spectra of 1060 nm laser (a) on free running and (b) after SBC

Fig. 10. Spectra of 1080 nm laser (a) on free running and (b) after SBC

Fig. 11. (a) SBC output power and free running laser power as a function of current; (b) combination efficiency of the SBC as a function of current