Analysis of spatial pseudodepolarizers in imaging systems
1990
The objective of a number of optical instruments is to measure
the intensity accurately without bias as to the incident polarization state.
One method to overcome polarization bias in optical systems is the insertion
of a spatial pseudodepolarizer. Both the degree of depolarization
and image degradation (from the polarization aberrations of the pseudodepolarizer)
are analyzed for two depolarizer designs: (1) the Cornu
pseudodepolarizer, effective for linearly polarized light, and (2) the dual
Babinet compensator pseudodepolarizer, effective for all incident polarization
states. The image analysis uses a matrix formalism to describe the
polarization dependence of the diffraction patterns and optical transfer
function.
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