Fig. 1. Primary characters of the SiC and traditional mirror materials.

Fig. 2. Computer controlled FSGJ-2 machine for manufacturing large aspheric surfaces.

Fig. 3. Flow chart for manufacturing a large aspheric mirror.

Fig. 4. Testing large mirror by a CMM.

Fig. 5. Polishing large mirror with a FSGJ-2.

Fig. 6. Testing of aspheric mirror by null compensation.

Fig. 7. Initial surface map tested by interferometry.

Fig. 8. Final test result by a CMM.

Fig. 9. Configuration for coordinate calibration.

Fig. 10. Final test results of the aspheric mirror. Test results of (a) surface map and (b) interferogram.