Fig. 1. Structural diagram of segmented diffractive primary lens

Fig. 2. Schematic of spherical deformation of sub-aperture

Fig. 3. Schematic of deformation error of surface without diffraction structure

Fig. 4. PSF and corresponding ZEMAX results. (a) PSF of spherical surface and (b) its corresponding ZEMAX result; (c) cross section of PSF and (d) its corresponding ZEMAX result

Fig. 5. Schematic of thickness errors

Fig. 6. Optical path

Fig. 7. Experimental setup

Fig. 8. Binary microstructure and its corresponding wavefront.(a) Microstructure; (b) wavefront

Fig. 9. Wavefront aberration of segmented primary lens

Fig. 10. Spots. (a)(b) Spot obtained by measurement of single sub-aperture; (c) spot obtained by coherent synthesis of two sub-apertures

Fig. 11. Simulation. (a) Simulation of single sub-aperture; (b) simulation of coherent synthesis of two sub-apertures