Fig. 1. (a) Schematic diagram of nematic liquid crystal birefringence; (b) Schematic diagram of phase spatial light modulator

Fig. 2. Superimposed Fresnel lens system focal length map

Fig. 3. (a) Phase diagram of a Fresnel lens with a focal length of 400 mm; (b) Initial spot; (c) A spot with a focal length of 200 mm; (d) A spot with a focal length of 300 mm; (e) A spot with a focal length of 400 mm

Fig. 4. Diagram of LCSLM modulated beam deflection angle

Fig. 5. Structure diagram based on blazed grating system

Fig. 6. Spot patterns with different diffraction angles. (a) Initial spot coordinates (3887 μm, 2745 μm); (b) =0.2 coordinates (4807 μm, 2742 μm); (c) =0.3 coordinates (5305 μm, 2709 μm); (d) =0.5 coordinates (6165 μm, 2727 μm) 不同衍射角度的光斑图。 (a) 初始光斑坐标(3887 μm, 2745 μm )；(b) =0.2 坐标(4807 μm, 2742 μm )；(c) =0.3 坐标(5305 μm, 2709 μm)；(d) =0.5 坐标(6165 μm, 2727 μm)；

Fig. 7. Relationship between the spot offset distance and the grating period

Fig. 8. Outgoing spot and phase gray scale map. (a) Initial spot coordinates (6165 μm, 2727 μm); (b) 45° rotation angle spot coordinates (5497 μm, 4303 μm); (c) Rotation angle 90° spot coordinates (3909 μm, 4978 μm)

Fig. 9. Phase shift model

Fig. 10. Flow chart of beam control

Fig. 11. Physical image of the experiment

Fig. 12. (a) 1920×1080 pixel gray value distribution; (b) LCSLM grayscale phase map

Fig. 13. (a) Initial spot coordinates (1.050 mm, 0.188 mm); (b) Initial spot coordinates (−1.313 mm, −0.938 mm); (c) Initial spot coordinates (0.938 mm, −1.125 mm); (d)-(f) Modulated spot coordinates (0,0)

Fig. 14. Result of the cross scan of the spot