Light separation device, blazed grating device, diffraction...

Details Light separation device, blazed grating device, diffraction... Light separation device, blazed grating device, diffraction...

2006-07-11

2006-07-11

Chowdhury, Tarifur R. (Department: 2871)

Liquid crystal cells, elements and systems

Liquid crystal optical element

Liquid crystal diffraction element

C349S202000, C349S096000, C359S573000, C359S494010

Reexamination Certificate

active

07075615

ABSTRACT:
A thin and light optical device satisfactorily separates light components having different properties. A blazed grating is formed on a surface of a flat-plate-shaped transparent substrate, and a separation coating that reflects or transmits incident light according to the properties of the incident light is provided on the blazed grating. The thus obtained optical device offers a function of separating light into reflected light and transmitted light, and also has a function of diffracting or refracting the thus separated light. As the separation coating, a polarization separation film, dichroic film, angle separation film, or chiral nematic liquid crystal layer is used to separate linearly polarized light components having different polarization planes, light components having different wavelengths, light components incident at different angles of incidence, or circularly polarized light components having different rotation directions.

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