Manufacture of fluoride glass preforms

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Abstract

Since vapour deposition methods for heavy metal fluoride glasses are still in the early stages of development, preforms are prepared by pouring two slightly different glass melts sequentially into a heated mould. In this paper, a shutter technique is described, which has been used to make both doped and undoped preforms, and which facilitates the production of more complex fibre structures.

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There are more references available in the full text version of this article.

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    Fluoride glass optical fibre preforms can be fabricated in several ways. One of the more successful is a method described by Clarke and Ito [1], colleagues of the authors, in which core and cladding are cast in the same mould with the object of ensuring intimate contact between the two glasses with a perfect interface between them. First the cladding glass is poured into a cylindrical heated brass mould and then core glass is immediately poured in on top of it.

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