Fig. 1. Non-spherical subaperture splicing interferometry with variable compensation of single optical wedge

Fig. 2. Schematic diagram of optical wedge aberration

Fig. 3. Simulation results of astigmatism and coma in wavefront of wedge with respect to wedge angle and tilt angle. (a1)(a2) Optical simulation results; (b1)(b2) theoretical calculation results; (c1)(c2) differences of optical simulation results and theoretical calculation results

Fig. 4. Aberration of wedge outgoing wavefront varying with its wedge angle. (a) Astigmatism; (b) coma

Fig. 5. Aberration of wedge outgoing wavefront varying with its tilt angle. (a) Astigmatism; (b) coma

Fig. 6. Aberration of wedge outgoing wavefront varying with thickness of wedge and distance between wedge and focal point. (a) Thickness of wedge; (b) distance between wedge and focal point

Fig. 7. Curves of aberration of wedge outgoing wavefront varying with different F numbers. (a) Astigmatism; (b) coma; (c) overall adjustment capacity

Fig. 8. Aspherical subaperture stitching interferometer with single-wedge compensation

Fig. 9. Single-wedge compensator and its adjustment device

Fig. 10. Schematic diagram of misalignment of rotation axis of single-wedge compensator

Fig. 11. Full-aperture detection result of tested parabolic mirror

Fig. 12. Whole pose adjustment results of optical wedge compensator. (a) Quasi-zero state interferogram of front surface of optical wedge; (b) quasi-zero state interferogram of rear surface of optical wedge

Fig. 13. Fringes of spherical mirror during zeroing process of single-wedge. Fringes of spherical mirror 1 (a) before and (b) after moving 1 mm; fringes of spherical mirror 2 (c) before and (d) after moving 1 mm

Fig. 14. Fringes of alignment processes of thickness and rotational axis of single-wedge. Fringes of (a) front and (b) rear surfaces with aligned wedge thickness; (c) initial and (d) final image plane fringes for zeroing state of single-wedge

Fig. 15. Measured partially aspherical fringes. (a) Schematic diagram of subaperture planning; (b)‒(f) subaperture fringes with rotational angles of 0°, 22.5°, 45°, 67.5°, and 90°, corresponding to apertures of numbers 1‒5 in subaperture planning diagram; (g) simulated fringes with rational angle of 0°

Fig. 16. Measurment results of aspherical surface type. (a) Splicing recovery phase of proposed method; (b) dot scanning result of LuphoScan 260; (c) residual