Analysis of focus distortion based on birefringence

Focus duplication based on birefringence is studied with a ray tracing program with special regard to separation efficiency and aberrations. It was shown that ordinary and extraordinary foci cannot be independently generated by linearly polarized incoming beams, when the numerical aperture exceeds the 0.1 limit. Point-spread-function analysis proved that optical aberrations—especially astigmatism—represent the main limitation of high quality focus duplication.

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