Glass polarizer for visible light

Optical: systems and elements – Polarization without modulation – By relatively adjustable superimposed or in series polarizers

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359492, 501 56, G02B 530, G02B 2728, C03C 311, C03C 1016

Patent

active

055173560

ABSTRACT:
A glass article that is effective in polarizing radiation in the range of 400-700 nm and method of making, the glass having an R.sub.2 O--Al.sub.2 O.sub.3 --B.sub.2 O.sub.3 --SiO.sub.2 base glass composition, a precipitated crystal phase consisting of a halide selected from the group composed of cuprous, cadmium and mixed cuprous-cadmium halides, the crystals in the crystal phase being elongated, and a portion of the crystals near the surface of the article being at least partially reduced to colloidal copper, whereby the article exhibits permanent dichroic behavior and has a polarization efficiency across the entire wavelength range of 400-700 nm of at least 0.80.

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patent: 3653863 (1972-04-01), Araujo et al.
patent: 3954485 (1976-05-01), Seward, III et al.
patent: 4304584 (1981-12-01), Borrelli et al.
patent: 4339256 (1982-07-01), Simms
patent: 4479819 (1984-10-01), Borrelli et al.
patent: 5430573 (1995-07-01), Araujo et al.

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