Glass polarizer for visible light

摘要

A glass article that is effective in polarizing radiation in the range of 400-700 nm and method of making, the glass having an R2O-Al2O3-B2O3-SiO2 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.