CPC G02F 1/13362 (2013.01) [G02B 5/3016 (2013.01); G02F 1/133526 (2013.01); G02F 1/133543 (2021.01); G02F 2201/343 (2013.01)] | 18 Claims |
1. An optical device, comprising:
a light source;
a polarization selective optical element including a stack of a plurality of cholesteric liquid crystal layers, the plurality of cholesteric liquid crystal layers including a first cholesteric liquid crystal layer with liquid crystal molecules arranged in a first helical configuration having a first pitch range for light of a first wavelength range and a second cholesteric liquid crystal layer with liquid crystal molecules arranged in a second helical configuration having a second pitch range for light of a second wavelength range that is different from the first wavelength range;
a partial reflector located between the light source and the polarization selective optical element;
a first lens positioned between the polarization selective optical element and the partial reflector; and
a second lens positioned relative to the polarization selective optical element so that the polarization selective optical element is positioned between the second lens and the partial reflector.
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