Fig. 1. Schematic of the Fresnel double-prism interference. (a) Top view of coordinate system after slot deflecting by a certain angle; (b) schematic of slot deflection

Fig. 2. Interference intensity variation diagram in x-direction of screen. (a) Changing spacing between slot and double prism; (b) changing spacing between slot and viewing screen; (c) changing double-prism wedge angle

Fig. 3. Interference fringe distributions and intensity distributions of observation plane for different deflection angles of slot. (a)(b)(c) Interference fringe distributions when γ=0°, 0.11°, 0.16°; (d)(e)(f) intensity distributions at z=0 on observation plane when γ=0°, 0.11°, 0.16°

Fig. 4. Interference fringe contrast as a function of γ under different slot lengths. (a) l=2 cm; (b) l=0.5 cm

Fig. 5. Captured images obtained when angle γ between slot and double prism ridge is increased. (a) Interferogram obtained when γ≈0°; (b) interferogram obtained when slot is rotated clockwise at a certain angle (i.e., γ is increased); (c) interferogram obtained when slot continues to rotate clockwise at a certain angle