Fig. 1. Radiation at different temperatures and its derivative curves

Fig. 2. Optical lens design results

Fig. 3. Optical lens structure diagram

Fig. 4. MTF of optical system at different pressure and temperature

Fig. 5. Cromatic distortion curve of optical system

Fig. 6. Dispersion spot of optical system at different temperature under defocusing condition.

Fig. 7. Envelope energy of optical system at different temperature under defocusing condition

Fig. 8. tolerance curve of optical system

Fig. 9. Optical system modeling

Fig. 10. Stray light analysis results in the field of view

Fig. 11. Out-of-field PST analysis results

Fig. 12. Fixed star（3：00 PM，along the direction of light）

Fig. 13. Fixed star（3：00 PM，against the light，30°solar angle）

Fig. 14. 3D energy map of stars（3：00 PM，against the light，30°solar angle）

Fig. 15. fixed star（4：00 PM，against the light，10°solar angle）

Fig. 16. 3D energy map of stars（4：00 PM，against the light，10°solar angle）