Fig. 1. Optical schematic of the Fizeau interferometer-based setup. NF, neutral filter; BE, beam expander; P, polarizer; Ap, aperture; NPBS, non-polarizing beam splitter; TL, tube lens; RP, reference plate.

Fig. 2. Optical schematic of the Fizeau cavity. (a) Non-collimated beam due to the presence of the MO. (b) Collimated beam using a telescope-like system.

Fig. 3. Off-axis holograms of (a) the object possessing a step height of 485 nm and (b) another object possessing a step height of 242 nm. The bad quality of the off-axis hologram of (a) may be come from the homemade manufacturing sample (non-standard).

Fig. 4. Reconstructed phase (radians) maps from the off-axis hologram of Fig. 3(a). Reconstruction (a) before and (b) after correction with the apodization method.

Fig. 5. Transmission profile of the apodized aperture. (a) The transmission from 0 to 1 at the edge of the aperture follows a cubic spline interpolation; the dashed line indicates the transmission of the unapodized aperture. (b) Numerically reconstructed amplitude contrast image in Fig. 5(b) after using the apodized aperture.

Fig. 6. Phase profile along the x direction of Fig. 4(b).

Fig. 7. Reconstructed phase (radians) maps from the off-axis hologram of Fig. 3(b). (a) Reconstruction before correction with the apodization method. (b) Reconstruction after correction with the apodization technique at the same values of kx and ky.

Fig. 8. Reconstruction of Fig. 3(b) by using the angular spectrum method. (a) Phase (radians) contrast image. (b) Amplitude contrast image.

Fig. 9. Phase profile along the x direction of Fig. 8(a).