Fig. 1. Schematic of segmented diffractive lens

Fig. 2. Light path of segmented lens

Fig. 3. Flow chart of piston and tip-tilt error analysis of segmented lens

Fig. 4. (a) Spot diagram of disorder segmented lens; (b) corresponding results of ZEMAX

Fig. 5. Calculated results of tilt error of single segmented lens. (a) Wavefront aberration of segmented 1 tilted by x' axis with 100 μrad; (b) results of ZEMAX corresponding to Fig. (a); (c) wavefront aberration of segmented 19 tilted by y' axis with 100 μrad; (d) results of ZEMAX corresponding to Fig. (c)

Fig. 6. Diagram of BP neural network structure

Fig. 7. Inner segmented lens without noise

Fig. 8. Outer segmented lens without noise

Fig. 9. Inner segmented lens with noise

Fig. 10. Outer segmented lens with noise

Table 1. Position of segmented lens and corresponding error type and value

Table 2. Tilt error comparison of ZEMAX and MATLAB

Table 3. Boundary range of piston and tip-tilt error of segmented lens

Table 4. Fitting error of BP neural netwrok