Treating glass compositions

Details Treating glass compositions Treating glass compositions

1985-07-18

1988-05-03

Bell, Mark L.

Glass manufacturing

Processes

Fining or homogenizing molten glass

65135, 65136, 65DIG16, 501 40, 501 35, 501 37, 501 38, 501904, C03B 516

Patent

active

047417528

ABSTRACT:
A process for treating a halide, e.g. fluoride, glass composition, characterized by contacting a melt of the composition with dry oxygen. Oxygen, simply on contact with a fluoride glass melt, converts transition metals, e.g. from Fe(II) to Fe(III), from one stable state to another and thereby reduces loss at transmission wavelengths in optical fiber, e.g. the loss at 2.7 .mu.m attributable to Fe(II).

REFERENCES:
patent: 4141741 (1979-02-01), Lucus et al.
patent: 4358543 (1982-11-01), Nozawa
patent: 4388413 (1983-06-01), Doremus et al.
Bendow et al., Physics of Fiber Optics, (Advances in Ceramics, vol. 2), pp. 59-60.
"Infrared-Optical Fibers", by Miyashita et al., IEEE J. of Q. Elec. QE-18, No. 10, (Oct. 1982), pp. 1432-1450.
"Infrared-Transparent Glasses Derived From the Fluorides of Zirconium, Thorium, and Barium", by Robinson et al., Mat. Res. Bull., 15, (1980), pp. 735-742.
"Minimization of OH Absorption and Scattering Losses in Zirconium Fluoride Glasses", by Tran, et al., Sixth Topical Meeting on Optical Fiber Communication, (Feb. 28-Mar. 2, 1983), New Orleans, Digest of Technical Papers, p. 7.
"Kinetics of Crystallization of ZrF.sub.4 -BaF.sub.2 -LaF.sub.3 Glass by Differential Scanning Colorimetry", by Bansal, et al., J. A. Ceram. Soc., 66 (4), (1983), pp. 233-238.
"Etude Phenomenologique du Role Stabilisateur de l'Aluminium dans les verres an Tetrafluorure de", (3), (1980), pp. 333-342.
"The Effects of Oxide Impurities on the Optical Properties of Fluoride Blasses", by Almeida et al., J. Non-Cryst, Solids, 56, (1983), pp. 63-68.

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