Fig. 1. Principle of pinhole point diffraction interferometer

Fig. 2. Wavefront analysis method of pinhole point-diffraction based on waveguide theory

Fig. 3. Coordinate system of pinhole diffraction

Fig. 4. Electric field amplitude distribution of TE₁₁ mode derived by analytical method. (a) E_x; (b) E_y; (c) E_r; (d) E_φ

Fig. 5. Electric field amplitude distribution at theback surface of pinhole derived by FDTD algorithm. (a) E_x; (b) E_y; (c) E_r; (d) E_φ

Fig. 6. Light transmittance of pinhole with different diameter

Fig. 7. Mode spectrum for pinhole

Fig. 8. Electric field amplitude distribution of mode in the pinhole. (a) TE₁₁; (b) TE₂₁; (c) TM₀₁

Fig. 9. Intensity distribution of diffraction wavefront. (a) Pinhole diameter D=λ; (b) pinhole diameter D=0.8λ; (c) pinhole diameter D=1.4λ; (d) cross section of intensity along different direction angle ?

Fig. 10. Phase distribution of electric field in the far field. (a) E?(far); (b) E

Fig. 11. Zernike polynomial fitting result. (a) Diffraction wavefront after fitting; (b) Zernike coefficients