Infrared broadband dichroic glass polarizer
AssigneeCorning Incorporated
InventorKenjiro Hasui
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Abstract
Polarized glass articles having a wavelength range that is broadened for high contrast-ratio applications. A method that imparts to a glass article a high contrast ratio of at least 40 dB for use as dichroic glass polarizers over a wavelength range of 880 nm to 1,690 nm while keeping a high transmission value. The method comprises the step of heating the glass article at a temperature ranging from 400 to 450° C. in a reducing atmosphere for a period of time ranging from 12 to 30 hours. Preferably, the reducing atmosphere is hydrogen at atmospheric pressure.
Claims8
A polarizing glass article comprising a base photochromic glass selected from either a copper or copper-cadmium family, or a silver halide-containing glass family having precipitated silver particles wherein the polarizing glass article exhibits a contrast ratio of at least 40 dB over a wavelength range of 880 nm to 1,690 nm and a bandwidth of 810 nm.
A polarizing glass article comprising a base glass selected from either a copper or copper-cadmium family, or a silver halide-containing glass family having precipitated silver particles wherein the polarizing glass article exhibits a contrast ratio of at least 50 dB over a wavelength range of 980 nm to 1,640 nm and a bandwidth of 660 nm.
Dependencies are inferred from the claim text.