Fig. 1. Whole interference detection process of piston error of segmented mirror

Fig. 2. Optical path of defocus interference detection for two sub-mirrors

Fig. 3. Detection optical path of segmented mirror seam step shape based on white light microscopic interferometry

Fig. 4. Principle of segmented mirror surface shape detection based on dual-wavelength interferometry. (a) Complete surface shape detection of segmented mirror; (b) optical path difference of step

Fig. 5. Process of solving relative piston error between sub-mirrors

Fig. 6. Schematic of solving piston error between sub-mirrors

Fig. 7. Cutting plan of hexagonal spherical sub-mirrors

Fig. 8. Optical path of co-phasing detection of segmented mirror based on Fizeau dual-wavelength interferometer

Fig. 9. Co-phasing installation system of segmented mirror. (a) Three-dimensional assembly; (b) actual view of system

Fig. 10. Adjustment process of near-zero fringe interferogram for segmented mirror

Fig. 11. Calibration process and results of white light microinterferometer. (a) Interferogram before piston error compensation; (b) interferogram after piston error compensation; (c) seam step topography distribution of segmented mirror under VSI detection mode

Fig. 12. Interferogram of segmented mirror in red and green dual wavelengths before and after piston error compensation. (a) Before compensation; (b) after compensation

Fig. 13. Three-dimensional image of segmented mirror initial wavefront surface shape. (a) Before compensation; (b) after compensation

Fig. 14. Three-dimensional image of segmented mirror fitting wavefront surface shape. (a) Before compensation; (b) after compensation