Glasses and methods for making them

Details Glasses and methods for making them Glasses and methods for making them

1982-12-02

1985-11-12

Metz, Andrew H.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

65134, 501 53, 501 55, 501903, C03C 310

Patent

active

045528500

ABSTRACT:
A glass suitable for use in optical fibre cores has a refractive index of 1.540-1.610, Na.sub.2 O and B.sub.2 O.sub.3 in a molar ratio of 1.05-2:1, 2-12 mole percent BaO, 40-63 mole percent SiO.sub.2, and 1.5-15 mole percent ZrO.sub.2, the proportion of SiO.sub.2 and ZrO.sub.2 together not exceeding 65 mole percent. The glass can be prepared in a highly reduced state by the use of CO and a redox buffering agent. The glass is especially suitable for the production of high numerical aperture wide cored fibres.

REFERENCES:
patent: 4179300 (1979-12-01), Sagara
patent: 4265667 (1981-05-01), Ikeda
patent: 4275951 (1981-06-01), Bealer et al.
patent: 4367012 (1983-01-01), Ikeda et al.
patent: 4445754 (1984-05-01), Bealer et al.
patent: 4452508 (1984-06-01), Bealer et al.
Yoshiyagawa, M. et al., Optical Transmission Properties of Low Loss Large . . . J. Non-Crystalline Solids, 40, 489-497 (1980), Chemical Abstracts 93:209118j, vol. 93 (1980).
Dunn, A. G., et al. Near Infrared Optical Absorption of Iron (II) in Some . . . Physics and Chemistry of Glasses, vol. 19, No. 1, (1978).

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