Compositions: ceramic – Ceramic compositions – Glass compositions – compositions containing glass other than...
Patent
1993-04-28
1994-11-15
Group, Karl
Compositions: ceramic
Ceramic compositions
Glass compositions, compositions containing glass other than...
501 43, 501 44, 501900, 501905, 501 48, 2523014P, 2523014H, C03C 332
Patent
active
053648196
ABSTRACT:
A Faraday rotator glass composition based on a fluoride glass, phosphate glass, fluorophosphate glass or a mixture thereof is doped with a lanthanide in a concentration sufficient to provide a Verdet constant above at least 2870 deg/Tesla-meter [(1 min/cm-Oe).times.(1.667.times.10.sup.4)=1 deg/Tesla-meter] and optical transmission above at least 50 percent in a 25 mm thick polished glass sample at least at one wavelength in the 200 to 400 nm wavelength region. The Faraday rotator glass also includes monovalent non-lanthanide cations such as Na, Li, K or mixtures thereof in a concentration sufficient to provide a Verdet constant above at least 2870 deg/Tesla-meter and optical transmission above at least 50 percent in a 25 mm thick polished glass sample at least at one wavelength in the 200 to 400 nm wavelength region. The Faraday rotator glass further includes a concentration of divalent or trivalent non-lanthanide cations such as Mg, Be, Ca, Al or mixtures thereof sufficient to provide surface flatness of at least 1/10 of the operating wavelength at 632.8 nm.
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J. L. Dexter et al., Ultraviolet Optical Isolators Utilizing KDP-Isomorphs, ol. 80 No. 2, Optics Communications, pp. 115-118 (15 Dec. 1990).
M. J. Weber, Faraday Rotator Materials, (Lawrence Livermore Laboratory, Livermore, Calif.) pp. 5,23-26, 29-32, 39-42, 83-86, 103-106, 139-142, 159-166 (1982), Jun.
Berger et al., Faraday Rotation of Rare-Earth(III) Phosphate Glasses, vol. 133 No. 3A, Physical Review, pp. A723-A727 (1964). No month.
Blackburn Douglas H.
Cooper David G.
Cranmer David C.
Dexter James L.
Kauffman Dale A.
Bonner C.
Edelberg Barry A.
Group Karl
McDonnell Thomas E.
The United States of America as represented by the Secretary of
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