Fig. 1. Schematic diagrams of (a) the CSBC, (b) the CBC, and (c) the SBC. LD, laser diode; AL, aspherical collimating lens; M, plane mirror; BS, beam splitter; TL, transmission lens; G, transmission grating; OC, output coupler.

Fig. 2. (a) Beam combining direction profile, (b) non-CBC direction profile, and (c) free-running profile.

Fig. 3. The purple curve in the graph represents the change in the beam combining efficiency with the current. The red curve represents the change in the output power of the CSBC structure with the current, and the black curve represents the change in the output power of a single LD with the current.

Fig. 4. (a) Measured results for the beam quality of a single laser emitter at 0.55 A. (b) Measured results for the beam quality of the CSBC structure at 0.55 A.

Fig. 5. Emission spectrum of the CSBC structure at an injection current of 0.55 A.