Fig. 1. Flow chart of GS-CNN method

Fig. 2. Model selection of CNN. (a) MSE versus number of convolutional layers; (b) structural diagram of CNN

Fig. 3. Simulation experimental results by GS-CNN method. (a)--(c) Target intensity distributions of Bessel beams; (d)--(f) output light intensity distributions of generated vortex beams; (g)--(i) LC-SLM phase holograms of generated vortex beams

Fig. 4. RMSE of output light intensity and target light intensity of Bessel beam generated by each method. (a) l=1; (b) l=3; (c) l=1 and 4

Fig. 5. DE between input beam energy and output beam energy of Bessel vortex beam. (a) l=1; (b) l=3; (c) l=1 and 4