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AssigneeNippon Telegraph and Telephone Corporation
InventorsKazuo Fujiura, Yasutake Ohishi, Michiya Fujiki, Terutoshi Kanamori, Shiro Takahashi
Estimating the term…
A method for preparing a homogenous fluoride glass containing high purity BaF.sub.2 through the CVD process using a gaseous mixture containing a barium .beta.-diketonate complex service as a first starting material and represented by the following general formula (1) of: ##STR1## where (i) R and R' are each --C(CH.sub.3).sub.3 ; or (ii) R is CH.sub.2 CH.sub.2 CH.sub.3 and R' is --C(CH.sub.3).sub.3 ; or (iii) R and R' are each CF.sub.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 perform 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 following by collapsing.
A process for preparing a fluoride glass containing barium and at least one other glass forming metal element comprising providing a gaseous mixture in a reaction vessel containing a substrate, reacting the ingredients of said gaseous mixture on said substrate or in gaseous phase to deposit metal fluoride on said substrate so as to form a fluoride glass, said gaseous mixture comprising:
A process for preparing a fluoride glass containing barium and at least one other glass forming metal element comprising providing a gaseous mixture in a reaction vessel containing a substrate, reacting the ingredients of said gaseous mixture in gaseous phase on said substrate to deposit metal fluoride on said substrate so as to form a fluoride glass, said gaseous mixture comprising:
A process for preparing a fluoride glass containing barium and at least one other glass forming metal element comprising providing a gaseous mixture in a reaction vessel containing a rod-like glass substrate reacting the ingredients of said gaseous mixture in a gaseous phase or on the surface of said substrate to deposit a layer or fine particles of fluoride glass on the surface of said substrate, said gaseous mixture comprising:
Dependencies are inferred from the claim text.