Method of making photosensitive colored glasses exhibiting alter

Details Method of making photosensitive colored glasses exhibiting alter Method of making photosensitive colored glasses exhibiting alter

1978-07-14

1980-03-04

Lindsay, Jr., Robert L.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 30E, 65 33, 65DIG2, 106 52, 106DIG6, C03C 2100

Patent

active

041915470

ABSTRACT:
This invention is concerned with hydrated glass articles having base compositions within the Na.sub.2 O and/or K.sub.2 O--ZnO--Al.sub.2 O.sub.3 --SiO.sub.2 --Cl field and having at least a surface layer thereon containing Ag--AgCl crystals which impart photoanisotropic effects to the glass articles. Silver ions are introduced into the surface layer through a solution ion exchange process with sodium and/or potassium ions of the parent glass. The silver remains in the ionic state until exposure to ultraviolet radiation which results in the development of silver-containing aggregates, i.e., Ag-AgCl, via a photolytic reaction. The aggregates contribute to photo-anisotropic absorption bands which are centered around 340 nm and 700 nm. Polarization of the photo-dichroic and photo-birefringent effects of the inventive products can be altered reversibly between two arbitrary directions without fatigue. The photo-anisotropic image can be read cyclically essentially indefinitely without destruction. The product of the invention is eminently suitable as a photosensitive medium for storing optical information.

REFERENCES:
patent: 3449103 (1967-06-01), Stookey
patent: 3656923 (1972-04-01), Garfinkel et al.
patent: 3912481 (1975-10-01), Bartholomew et al.
patent: 3948629 (1976-04-01), Bartholomew et al.
patent: 4057408 (1977-11-01), Pierson et al.

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