Glasses Technology

Glasses Patent Description

BACKGROUND OF THE INVENTION

This invention is related to Faraday rotation glasses and is more particularly concerned with a new Faraday rotation glass which exhibits a high Verdet constant and low susceptibility toward devitrification. (more…)

Glasses Patent Claim

We claim:

1. A Faraday rotation glass exhibiting a high Verdet constant and low susceptibility toward devitrification consisting essentially of the following constituents as expressed in weight percent:

where the alkaline earth oxide is selected from the group consisting of CaO, BaO, ZnO, and combinations thereof, the rare earth oxide is selected from the group consisting of Tb.sub.4 O.sub.7, and the combination of Tb.sub.4 O.sub.7 and La.sub.2 O.sub.3, the Tb.sub.4 O.sub.7 being present in an amount of 20-45 weight percent, and the alkali metal oxide being selected from the group consisting of Na.sub.2 O, K.sub.2 O, and combinations thereof. (more…)

United States Patent 3,935,020
Deeg , et al. January 27, 1976

Glasses Patent Abstract
Faraday rotation glasses exhibiting a high Verdet constant and a low susceptability toward devitrification are formed by introducing a high quantity of rare earth oxides into a borate glass base. The glasses can be melted under standard environmental conditions and may be made on a large scale.