Process for the preparation of fluoride glass and process for th

Details Process for the preparation of fluoride glass and process for th Process for the preparation of fluoride glass and process for th

1989-03-01

1991-12-10

Kratz, Peter

Glass manufacturing

Processes

Forming product or preform from molten glass

65 182, 65DIG16, C03B 3718

Patent

active

050714600

ABSTRACT:
Provided is a process for preparing a homogeneous fluoride glass containing high purity BaF.sub.2 through the CVD process characterized in that the used gaseous mixture comprising: a barium .beta.-diketonate complex serving as a first starting material and represented by the following general formula (1) of: ##STR1## wherein R is an alkyl group having 1 to 7 carbon atoms, R' is a substituted alkyl group having fluorine atoms substituting hydrogen atoms and represented by C.sub.n F.sub.2n+1 where n is an integer of from 1 to 3;
a gaseous or vaporizable compound of the metallic element constituting said fluoride glass, the gaseous or vaporizable compound serving as a second starting material; and a fluorine-containing gas serving as fluorinating agent. Further provided is a process for preparing a preform for a fluoride optical fiber which is low in transmission loss, by depositing the fluoride glass over the interior wall of a cylindrical tube or the wall of rod-like glass substrate through the CVD process followed by collapsing.

REFERENCES:
patent: 4378987 (1983-04-01), Miller et al.
patent: 4711652 (1987-12-01), Roba
patent: 4718929 (1988-01-01), Power et al.
Seiko Mitachi et al., "Preparation of Low Loss Fluoride Glass Fibers", Japanese Journal of Applied Physics, vol. 21, No. 1, pp. L55-L56 (1982).

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