CPC G02B 5/3083 (2013.01) [G02B 5/3066 (2013.01); G02F 1/133528 (2013.01); G02B 27/286 (2013.01); G02F 1/133541 (2021.01)] | 30 Claims |
1. An angle-filter, comprising:
exactly two polarizers that function as circular polarizers along a same light beam path, comprising:
an input circular polarizer; and
an analyzing circular polarizer; and
a retarder positioned between the circular polarizers, the retarder having a thickness-direction retardation;
wherein the thickness-direction retardation of the retarder (R1h) is selected to produce a prescribed angle-of-incidence dependent transmission function, and
wherein the circular polarizers reduce the amount of azimuth-dependence in the transmission function.
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