Compositions: coating or plastic – Coating or plastic compositions – Alkali metal silicate containing
Patent
1974-09-16
1976-03-16
Douglas, Winston A.
Compositions: coating or plastic
Coating or plastic compositions
Alkali metal silicate containing
106 52, 252 6251, 2523014F, G02B 530, C09K 1108, C03C 304, G02F 109
Patent
active
039443299
ABSTRACT:
There is disclosed a Faraday rotator device suitable for radiation phase shifters, isolators and shutters, that operate in the visible and infrared regions of the electromagnetic spectrum. The device includes (1) means for supplying polarized, electromagnetic radiation, (2) a lithia-silica-terbia glass article capable of effecting Faraday rotation when subjected to a magnetic field, and (3) means for inducing a magnetic field within the glass article, the glass generally comprising about 61-80 mole percent SiO.sub.2, 15-27.5 mole percent Li.sub.2 O, 3-9 mole percent Tb.sub.2 O.sub.3, and optionally, up to about 3 mole percent of R.sub.2 O.sub.3, such as Al.sub.2 O.sub.3 or B.sub.2 O.sub.3 --and optionally, minor amounts of Na.sub.2 O, K.sub.2 O or CaO, providing the sum of Li.sub.2 O + Na.sub.2 O + K.sub.2 O + CaO is not substantially greater than about 32.5 mole percent.
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Lee, Jr. Haynes A.
Rapp Charles F.
Bell Mark
Douglas Winston A.
Heberling Richard D.
Holler E. J.
Owens--Illinois, Inc.
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