Infrared filter using cholesteric liquids

Details Infrared filter using cholesteric liquids Infrared filter using cholesteric liquids

G - Physics

02

F

88/121, 345/59

G02F 1/00 (2006.01) G02B 5/26 (2006.01) G02B 5/28 (2006.01) G02B 5/30 (2006.01)

Patent

CA 1325741

INFRARED FILTER USING CHOLESTERIC LIQUIDS ABSTRACT OF THE INVENTION A high precision optical filter includes a wideband filter element and a cholesteric liquid crystal notch filter element. In one embodiment, a wideband infra- red filter blocks infrared wavelengths beginning at a nearly visible corner wavelength and a cholesteric liquid crystal filter blocks transmission of infrared wavelengths in a precise narrow band that includes the corner wavelength and that extends down to visible wavelengths. The liquid crystal filter may include a polymer for maintaining maximum reflectivity of the filter near the corner wavelength over an anticipated operating temperature range. The combined optical filter may be fabricated by depositing a matched pair of liquid crystal cholesteric films on a glass infrared filter element. In another embodiment, an optical filter according to the invention forms an eyepiece in a night vision goggles assembly for blocking visible light. The filter may also be mounted on a display device to block the transmission of undesirable infrared emissions at the source.

603893

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