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AssigneeNippon Telegraph and Telephone Corporation
InventorsKazuo Fujiura, Yasutake Ohishi, Michiya Fujiki, Terutoshi Kanamori, Shiro Takahashi
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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.
A process for preparing a fluoride glass containing barium and at least one other metal glass forming element comprising providing a gaseous mixture in a reaction vessel containing a substrate to react the ingredients of said gaseous mixture on said substrate or in gaseous phase to deposit metal fluoride to form a fluoride glass, said gaseous mixture comprising:
A process for preparing a fluoride glass containing barium and at least one other metal glass forming element comprising providing a gaseous mixture in a reaction vessel containing a substrate to react the ingredients of said gaseous mixture in the gaseous phase on said substrate to deposit metal fluoride to form a fluoride glass, said gaseous mixture comprising:
A process for preparing a fluoride glass containing barium and at least one other metal glass forming element comprising providing a gaseous mixture in a reaction vessel containing a rod-like glass substrate to react the ingredients of said gaseous mixture in a gaseous phase or on said substrate to deposit a layer or fine particles of fluoride glass on the surface of said substrate, said gaseous mixture comprising:
A process for preparing a fluoride glass containing barium and at least one other metal glass forming element comprising reacting a gaseous mixture in a reaction vessel containing a substrate, said gaseous mixture comprising the following components
Dependencies are inferred from the claim text.