Halide fibre with high numerical aperture

Details Halide fibre with high numerical aperture Halide fibre with high numerical aperture

1988-02-02

1989-06-06

Lee, John D.

350 963, G02B 616

Patent

active

048366439

ABSTRACT:
A high numerical aperture optical fibre, e.g. for use in remote spectroscopy, has a cladding of a halide glass which contains Hf and a core of a halide glass which contains Pb. Preferably both glasses contain ZrF.sub.4, BaF.sub.2, LaF.sub.3, AlF.sub.3 and NaF. In addition the cladding contains HfF.sub.4 but no PbF.sub.2 and the core contains PbF.sub.2 but no HfF.sub.4.

REFERENCES:
patent: 4666247 (1987-05-01), MacChesney et al.
Journal of Lightwave Technology, vol. LT-3, No. 3, Jun. 1985, pp. 569-573, IEEE, New York, U.S.; H. Tokiwa et al.: "A Core-Clad Composition for Crystallization-Free Fluoride Fibers", Table III, core; table VI, clad.
Journal of Lightwave Technology, vol. LT-2, No. 5, Oct. 1984, pp. 566-586, IEEE, New York, U.S.; D.C. Tran et al.: "Heavy Metal Fluoride Glasses and Fibers: A Review", Table 1.
Patent Abstracts of Japan, vol. 10, No. 226 (C-364) [2282], Aug. 7th, 1986; & JP-A-61 63 544 (Kokusai Denshin Denwa Co. Ltd) 01-04-1986.
Chemical Abstracts, vol. 96, No. 10, Mar. 8th, 1982, p. 292, Abstract No. 73413d, Columbus, Ohio, U.S.; M. G. Drexhage et al.: "Fluoride Glasses for Visible to Mid-IR Guided-Wave Optics", & Adv. Ceram. 1981, 2 (phys. fiber Opt.) 57-73.
Chemical Abstracts, vol. 104, No. 4, Jan. 27th, 1986, p. 402, Abstract No. 26632y, Columbus, Ohio, U.S.; H. Tokiwa et al.: "Core-Clad Composition for Ultralow-Loss Fluoride Glass Fibers", & Mater. Sci. Forum 1985, 5 (Halide Glasses, vol. 1) 411-15.
Chemical Abstracts, vol. 97, No. 6, Aug. 9th, 1982, p. 240, Abstract No. 42796X, Columbus, Ohio, U.S.; T. Manabe: "Fluoride Glasses for Infrared Optical Fibers", & Seramikkusu 1982, 17(4), 271-7.

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