Fig. 1. Design of aGPS. (a) Encoding and mapping (first 5 terms); (b) normalized axial intensity distribution

Fig. 2. Evolution of radial-shearing interferometric path. (a) Confocal zone plate; (b) non-confocal zone plate; (c) single aGPS

Fig. 3. Radial-shearing interferometric path based on aGPS

Fig. 4. 114 mm diameter aGPS

Fig. 5. Interferograms at different recording positions of aGPS. (a) Before short focus; (b) in focus; (c) after long focus

Fig. 6. Optical simulation results by software GLAD. (a) Test object; (b) object beam before balance of intensity at two focal spots; (c) reference beam before balance of intensity at two focal spots; (d) radial-shearing interferogram before balance of intensity at two focal spots; (e) object beam after balance of intensity at two focal spots; (f) reference beam after balance of intensity at two focal spots; (g) radial-shearing interferogram after balance of intensity at two focal spots

Fig. 7. Radial-shearing interferometric experiment. (a) Principle diagram and optical setup; (b) interferogram under joint action of test object and background; (c) central skeleton under joint action; (d) wavefront gradient under joint action; (e) interferogram under background aberration; (f) central skeleton under background aberration ; (g) wavefront gradient under background aberration

Fig. 8. Wavefront reconstruction results of radial-shearing interferometric experiment. (a) Non-confocal photon sieve;