Fig. 1. Schematic diagram of light propagation at the intersection of light and optical elements. (a) Mirror; (b) Lens

Fig. 2. Flow chart of the optimization method for error sensitivity of the optical system

Fig. 3. Coaxial two-mirror optical system

Fig. 4. Initial system layout of the coaxial two-mirror optical system

Fig. 5. Catadioptric optical system with two correcting mirrors in a 2° field of view. (a) Layout diagram; (b) MTF diagram

Fig. 6. A catadioptric optical system with four correcting mirrors in a 4° field of view. (a) Layout diagram; (b) MTF diagram

Fig. 7. Optical system optimized for image quality – “System 1”. (a) Layout diagram; (b) MTF diagram

Fig. 8. System layout and MTF diagrams during error sensitivity optimization. (a) “System 2” layout; (b) “System 3” layout; (c) “System 4” layout; (d) “System 2” MTF diagram; (e) “System 3” MTF diagram; (f) “System 4” MTF diagram

Fig. 9. Monte Carlo analysis results of “System 1”, “System 2”, “System 3” and “System 4”. (a) “System 1”–The system before desensitization optimization; (b) “System 2”; (c) “System 3”; (d) “System 4”–Optimal system

Fig. 10. MTF Monte Carlo analysis result diagram from “System 1” to “System 4”