Fig. 1. Damage to the correction surface of the phase corrector

Fig. 2. Test result of mirror surface shape

Fig. 3. Simulation model. (a) Structure of the phase corrector; (b) bonding position

Fig. 4. Initial stress stereo distribution of the phase corrector

Fig. 5. Stress distribution diagram of mirror surface

Fig. 6. Path distribution diagram of stress

Fig. 7. Mirror stress distribution of the improved structure

Fig. 8. Stress path distribution diagram of the improved structure

Fig. 9. Surface shape with new material. (a) Surface shape; (b) reconstructed wavefront

Fig. 10. Surface shape after secondary treatment. (a) Surface shape; (b) reconstructed wavefront