Fig. 1. Pattern distribution of CGH

Fig. 2. Optical layout of the calibration of Offner null using CGH

Fig. 3. The optical layout of concave hyperboloid mirror by Offner compensator

Fig. 4. Ray tracing schematic diagram

Fig. 5. The image quality of calibration path. (a) Spot diagram; (b) wavefront function

Fig. 6. CGH phase function and spatial frequency distribution

Fig. 7. Optical layout of the alignment hologram

Fig. 8. Alignment hologram patterns (line width magnified by 200 times )

Fig. 9. Calibration experiment of Offner compensator

Fig. 10. Calibration result of the Offner compensator

Fig. 11. The Φ856 mm concave hyperboloid mirror and its surface measured by the calibrated Offner compensator