Fig. 1. The basic principle of beam shaping based on a laser array.

Fig. 2. The simulated results. (a1)–(d1) Phase structures of the laser array at the source plane; (a2)–(d2) intensity distributions of the combined beams in the far field.

Fig. 3. Experimental setup of the beam-shaping system. SL, seed laser; PA, pre-amplifier; FS, fiber splitter; PM, phase modulator; VDL, variable delay line; FA, fiber amplifier; CO, collimator; BS, beam splitter; LC, liquid crystal; L, lens; PD, photodetector; BE, beam expander; HRM, high reflectivity mirror; PC, power collector; CCD, charge-coupled device; FPGA, field-programmable gate array.

Fig. 4. The feedback signal detected by the PD. (a) Open loop and (b) closed loop.

Fig. 5. (a1)–(d1) The phase structures at the source plane. The corresponding intensity distributions in the far field: (a2)–(d2) simulated results; (a3)–(d3) experimental results.

Fig. 6. (a1)–(f1) The phase structures at the source plane. The corresponding intensity distributions in the far field: (a2)–(f2) simulated results; (a3)–(f3) experimental results.

Fig. 7. (a1)–(d1) The phase structures at the source plane. The corresponding intensity distributions in the far field: (a2)–(d2) simulated results; (a3)–(d3) experimental results.