High pressure fluorine method for producing preform for optical

Details High pressure fluorine method for producing preform for optical High pressure fluorine method for producing preform for optical

1990-05-21

1991-10-01

Schor, Kenneth M.

Glass manufacturing

Processes

Forming product or preform from molten glass

65DIG16, 65 182, 65 301, 65 312, 65 314, C03C 2502

Patent

active

050530682

ABSTRACT:
A method for producing a glass preform for use in the fabrication of an optical fiber, including the steps of forming a glass soot preform from a glass-forming raw material and heating the soot preform to vitrify it, the soot preform being heated in an atmosphere comprising SiF.sub.4 under pressure higher than 1 atm. for a period of time sufficient to add fluorine, between the formation of the soot preform and the vitrification of it, fluorine being added at a high rate and in a large amount.

REFERENCES:
patent: 4579571 (1986-04-01), Hicks
patent: 4586943 (1986-05-01), Kyoto
patent: 4629485 (1986-12-01), Berkey

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