The static large field of the view polarization interference imaging spectrometer is based on the modified Savart polariscope.There appears a dispersion between the ordinary ray and extraordinary ray when light passes through the modified Savart polariscope.The dispersion greatly influences the intensities and the results of the interferogram and target image in the static large field of the view polarization interference imaging spectrometer.At the same time,the incident angle determines the dispersion.When the light goes through the modified Savart polariscope,the dispersion occurs in the left plate,the half-wave plate and the right plate of the modified Savart polariscope.Using the extension of Snell's law,the dispersion in the crystal is theoretically calculated and numerically simulated separately.The relationship curve between incident angle and the dispersion is obtained by simulation.
The refraction of rays in the Savart polariscope is different from the isotropic medium. We have analysed and discussed the refraction of rays in the Savart polariscope on the basis of the Snell law. The refraction formulae of the extraordinary rays and ordinary rays were derived. Results obtained may provide theoretical and practical guide lines for studying,developing and engineering of polarization interference imaging spectrometer.
