Fig. 1. Schematic of volume holographic grating preparation by DOE

Fig. 2. Schematic of the amplitude constraint region of the output plane

Fig. 3. Flowchart of improved algorithm

Fig. 4. Output amplitude of target

Fig. 5. Simulation results of GS algorithm

Fig. 6. Relationship between α₁ and different evaluation parameters

Fig. 7. Simulation results of proposed algorithm

Fig. 8. Schematic of experimental setup

Fig. 9. The experimental results