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Light propagation through birefringent media is a complex process involving double refraction, polarization rotation, and nonuniform phase shifts. The following example illustrates the case of a linearly polarized beam focused through a slab of aragonite. The aluminum coating at the bottom of the slab acts as a mirror, reflecting the beam back towards the lens. The recollimated beam passes through a crossed polarizer, and is monitored at the observation plane.

(left) Intensity pattern at the observation plane and (right) logarithmic plot of intensity distribution at the observation plane.

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