Fig. 1. Structure diagram of dense spectral beam combining of dichroic mirror

Fig. 2. Incident central wavelength versus incident angle

Fig. 3. Transmission efficiency versus incident angle for laser with different wavelengths

Fig. 4. Principle diagram of laser diode wavelength stabilization

Fig. 5. Measurement curves of power and efficiency of fiber coupling module

Fig. 6. Variation of 976 nm laser wavelength with current or temperature. (a) Variation with current; (b) variation with temperature

Fig. 7. Physical picture of dense spectrum beam combining experiment

Fig. 8. Schematic of common aperture beam combining monitoring optical path

Fig. 9. Axial displacement error of near field and pointing error of far field

Fig. 10. Output power, combining efficiency and spectral curve of combined beam. (a) Output power and combining efficiency; (b) spectral curve

Fig. 11. Three-dimensional display of beam quality of combined beam source

Fig. 12. Temperature monitoring charts of dichroic mirror under different driving current values. (a) Beam combiner 1; (b) beam combiner 2