Fig. 1. Optical layout of DCSIIS

Fig. 2. Structure of Savart polariscope

Fig. 3. (a) Absolute value of calcite birefringence as a function of wavelength; (b) absolute value of quartz birefringence as a function of wavelength

Fig. 4. Optical path difference as functions of i and ω

Fig. 5. Optical path difference as functions of i and t

Fig. 6. Optical path difference as functions of λ and t

Fig. 7. Equivalent interference path model of Savart plate

Fig. 8. Equivalent model of Young’s double slit interference path

Fig. 9. Distribution of the actual optical path difference corresponding to different lateral displacements and focal lengths. (a) d=1 mm, f3=41.5 mm; (b) d=1.2 mm, f3=49.8 mm; (c) d=1.4 mm, f3=58.1 mm; (d)d=1.6 mm, f3=66.4 mm