Fig. 1. Schematic of Fresnel lens

Fig. 2. Schematic of axial error

Fig. 3. Schematic of eccentric error

Fig. 4. Schematic of tilt error

Fig. 5. Schematic of comprehensive error

Fig. 6. Structure schematic of diffractive telescope

Fig. 7. Structure of primary mirror

Fig. 8. Image quality evaluation. (a) Wavefront diagram; (b) dispersive focal shift diagram

Fig. 9. Simulation results. (a) Wavefront diagram of eccentric error; (b) wavefront diagram of axial error; (c) wavefront diagram of tilt error; (d) far field distribution of eccentric error; (e) far field distribution of axial error; (f) far field distribution of tilt error

Fig. 10. Simulation results. (a) Wavefront diagram of comprehensive error; (b) far field distribution of comprehensive error

Fig. 11. Simulation results. (a) Wavefront diagram of comprehensive error; (b) far field distribution of comprehensive error