Fig. 1. Schematic of experimental setup to test relationship between the DM temperature rise and the laser beam quality.

Fig. 2. The influence of temperature rise of the DM on the beam quality and beam focus position.

Fig. 3. The influence of the DM with different temperatures on the far-field spot and focus offset of beam.

Fig. 4. Angular deviation test diagram of the two sub-beam lasers overlapping in a far-field spot.

Fig. 5. The relationship between angular deviation and beam quality.

Fig. 6. Angular overlap of the two sub-beam lasers at the focus position. (a) When the two sub-beams overlap almost completely, the quality of the combined beam is consistent with that of a single beam, and the corresponding angular deviation is close to 0 μrad. (b) When the two sub-beams are in a state of maximum overlap, the beam quality of the combined beam is slightly higher than that of a single beam, and the corresponding angular deviation is 27 μrad. (c) When the two sub-beams are completely separated, the beam quality of the combined beam deteriorates severely, and the corresponding angular deviation is 117.1 μrad.

Fig. 7. Physical structure design and the measured spectrum of the DMs. (a) The physical structure of the DM designed using OptiLayer. (b) Measured spectra of the three types of DMs.

Fig. 8. Active control technology hardware. (a) Angle monitoring device. (b) Fast-steering mirror device.

Fig. 9. Overall structure diagram. (a) Performance testing for the prototype of the wavelength combined source. (b) Physical diagram of the beam combination system prototype.

Fig. 10. Performance parameters of the combined beam light source. (a) Power of the combined beam light source. (b) Temperature rise of the DM under full power irradiation. (c) Beam quality of the combined beam light source at full power.