Fig. 1. Schematic diagram of the waveguide-based CBC system.

Fig. 2. Schematic diagram of a tapered waveguide.

Fig. 3. Amplitude distribution in the SCTW for Gaussian beam propagation. (a) Offset input Gaussian beam and (b) axially aligned input Gaussian beam.

Fig. 4. Field distribution at the output of the SCTW. (a), (c), (e), and (g) are for the self-imaging of the laser beam; (b), (d), (f), and (h) are for the combination application.

Fig. 5. Field distributions at the output of the SCTW for different taper angles. (a), (c) Amplitude distribution and (b), (d) Phase distribution.

Fig. 6. 3×3 fiber laser array.

Fig. 7. Transverse intensity distribution of 3×3 fiber lasers.

Fig. 8. Transverse intensity distribution of 3×3 fiber lasers.

Fig. 9. Optimal designation of the system and the results. (a) M2 as a function of t, (b) near-field distribution for the optimum t, and (c) far-field intensity distribution for different t.

Fig. 10. M2 as a function of t for different beam array.

Fig. 11. Dependence on taper angle. N=2, W1=50  μm.

Fig. 12. Combining based on 2D SCWT. (a) Schematic diagram of a 2D tapered waveguide, (b) intensity distribution of input laser beams, and (c) intensity distribution of output laser beams.