Fig. 1. Normalized period structure of Dammann grating. (a) Odd type; (b) even type

Fig. 2. Simplified model of liquid crystal panel

Fig. 3. Schematic of the way to remove zero-order beam interference. (a) Without removing zero-order beam; (b) superimposed shining grating grayscale map; (c) superimposed Fresnel lens grayscale map; (d) loaded Dammann grating grayscale map

Fig. 4. Dammann grating grayscale map generation process. (a) using simulated annealing algorithm combined with optimal evaluation function to solve the set of phase turning points within the normalized period; (b) grayscale map form generated by matrix filling and multi-period expansion

Fig. 5. 2D Dammann grating grayscale map form generation method

Fig. 6. Change of the beam splitting uniformity of the ideal structure and the pixelated structure of the Dammann grating with the focus spacing. (a) One-dimensional quintuple beam odd type; (b) one-dimensional sixfold beam even type

Fig. 7. Experimental device diagram of laser beam splitting verification system

Fig. 8. Multiple light point distribution light intensity images generated by loading phase distribution maps generated in different ways. (a) CGH generated by IFTA; (b) CGH in grating form generated by GSW algorithm; (c) grayscale map form transformed by Dammann grating structure

Fig. 9. Multifocus distribution light intensity images and fractional effect curves generated by loading Dammann grating grayscale map. (a1)(a2) one-dimensional dual-beam; (b1)(b2) one-dimensional seven-beam; (c1)(c2) two-dimensional dual-beam