Vapor phase method for making metal halide glasses
AssigneeCorning Glass Works
InventorsJoseph M. Power, Ahmad Sarhangi
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Abstract
A vapor phase method for making a metal halide material useful for the manufacture of an infrared transmitting optical waveguide fiber or other optical device, and the use of the method for making such a device, wherein a halogenated beta-diketonate of a metal to be incorporated in the device is converted to the corresponding metal halide by controlled decomposition of the halogenated diketonate, are described.
Claims18
A method for making a metal halide product which comprises the steps of:
- (a) introducing into a reaction zone a reactant vapor stream which comprises vapors of a halogenated metal beta-diketonate containing the metal and the halogen to be incorporated into the metal halide product;
- and
- (b) supplying energy to the reactant vapor stream at a rate sufficient to cause the decomposition of the metal beta-diketonate and the formation of a vapor deposition product therefrom which consists essentially of the metal halide of the metal and the halogen, the metal beta-diketonate being the principal source of both metal and halogen in the metal halide.
In a method for forming a metal halide optical fiber preform comprising the steps of providing a substrate, flowing reactive vapors into a reaction zone adjacent the substrate, and reacting the vapors to form a metal halide precursor material which is deposited onto the substrate, the improvement characterized in that the reactive vapors comprise a halogenated beta-diketonate containing the halogen and the metal to be incorporated as a metal halide in the precursor, and in that the halogenated beta-diketonate constitutes the principal source of both metal and halogen in the metal halide.
In a method for forming a metal halide optical fiber preform comprising the steps of providing a hollow tubular substrate, flowing reactive vapors into a reaction zone within the tubular substrate, and reacting the vapors to form a metal halide precursor material which is deposited onto the inner surface of the substrate, the improvement characterized in that the reactive vapors comprise a halogenated beta-diketonate containing the halogen and the metal to be incorporated as a metal halide into the precursor, and in that the halogenated beta-diketonate constitutes the principal source of both metal and halogen in the metal halide.
A method for making a product consisting essentially of a substantially oxygen-free vapor deposited metal halide which comprises the step of decomposing a vaporized fluorinated beta-diketonate of the metal to form the corresponding metal fluoride by intramolecular fluorine transfer, such that the fluorinated beta-diketonate constitutes the principal source of metal and halogen in the metal halide product.
A method for making a substantially oxygen-free vapor deposited metal halide which comprises the step of decomposing a fluorinated beta-diketonate of the metal to form the corresponding metal fluoride by intramolecular fluorine transfer wherein the decomposition is promoted by thermal heating of the beta-diketonate at a temperature sufficient for metal fluoride formation but below the temperature at which significant carbonization of the beta-diketonate will occur, such that the fluorinated beta-diketonate constitutes the principal source of metal and halogen in the metal halide product.
Dependencies are inferred from the claim text.