Lead-containing fluoride glass, optical fiber and process for pr

Details Lead-containing fluoride glass, optical fiber and process for pr Lead-containing fluoride glass, optical fiber and process for pr

1995-03-06

1997-12-09

Ryan, Patrick

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

428373, 428375, 428389, 385142, 385144, 501 40, B32B 900

Patent

active

056958803

ABSTRACT:
Lead-containing fluoride glass comprises 50-70 mol % of ZrF.sub.4, 3-5 mol % of LaF.sub.3, 0.1-3 mol % of YF.sub.3, and 2-15 mol % of NaF and/or LiF and/or CsF, where LaF.sub.3 +YF.sub.3 =4.5-6 mol %, and further comprises lead. An optical fiber comprises a core made of the lead-containing fluoride glass and a cladding surrounding the core. A process for producing an optical fiber comprises forming a base material for a core of the lead-containing fluoride glass, forming a base material for a cladding of fluoride glass containing 30-60 mol % of HfF.sub.4, and drawing the base materials into an optical fiber at a drawing temperature of 315-340 .degree. C.

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Clare et al., "The Effect of Refractive Index Modifiers on the Thermal Expansion Coefficient of Fluoride Glasses", Physics And Chemistry Of Glasses, vol. 30, No. 6, Dec. 1989, Sheffield GB, pp. 207 and 208.
France et al, "Fluoride Glass Optical Fibers", Dec. 1990, Blackie, London, pp. 163-167 and 240-251.

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