Fig. 1. Liquid crystal axicon structure

Fig. 2. Simulation results of electric field of liquid crystal axicon

Fig. 3. Response curve of liquid crystal to electric field

Fig. 4. Wavefront interferograms of liquid crystal axicon. (a) V₁=30 V, V₂=10 V; (b) V₁=40 V, V₂=10 V; (c) V₁=60 V, V₂=10 V

Fig. 5. Wavefront fitting diagram of lens under different voltages

Fig. 6. Schematic diagram of generating local hollow beam

Fig. 7. Focus images of laser by system. (a) V₁=30 V, V₂=10 V; (b) V₁=40 V, V₂=10 V; (c) V₁=60 V, V₂=10 V

Fig. 8. Experimental device for imaging with extended depth of field realized by using liquid crystal axicon

Fig. 9. Effect of extended depth of field imaging

Fig. 10. System imaging effects with and without voltage applied to liquid crystal axicon. (a) Imaging effects when liquid crystal axicon is not working; (b) imaging effects when liquid crystal axicon is working

Fig. 11. Change of MTF30 with object distance