Fig. 1. Periodic modulation function vector K versus the angle θ.

Fig. 2. Schematic diagram of the output angle of the signal light.

Fig. 3. Spectral range of signal channel (a) when α=0 the relationship between the incidence angle and the spectral range of the signal channel and (b) when ψ=0, the relationship between the non-collinear angle in the crystal and the spectral range of the signal channel.

Fig. 4. Schematic diagram of the output angle of signal light based on the Fourier transform of the pump beam.

Fig. 5. Schematic diagram of broad spectrum measurements based on monochromatic scanning system.

Fig. 6. Analysis of laser spot.

Fig. 7. Relationship between the wavelength and photon count rate.

Fig. 8. Theoretical and experimental diagrams of photon count rate versus signal wavelength. The big block diagram represents the experimental data. The small diagram represents the theoretical data (0°≤ψ≤1.1°,α=0°,0°≤θ≤90°,Gaussian distribution of pump beam).