Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1991-06-27
1993-05-18
Lindsay, Robert L.
Glass manufacturing
Processes
Forming product or preform from molten glass
C03B 3718, C03B 1903
Patent
active
052117316
ABSTRACT:
A method for producing internally coated glass tube preforms for drawing er optic conductors. The internally coated glass tubes are halogen coated, preferably coated with metal fluorides, so that an optical fiber formed will have a halogen core which conveys light having a wavelength of about 2 to 4 microns, which is in the infrared region, with low attenuation. With one aspect of the method, a carrier gas and a halogenated alkoxide are introduced into a glass tube which has an inner wall and which is surrounded by a resonator for producing a plasma from the halogenated alkoxide in the tube. With another aspect of the method, a blend of a carrier gas, an organometallic compound, and a halogen-containing gas are introduced into a glass tube which has an inner wall and which is surrounded by a resonator for producing a plasma. In both cases, the tube is moved relative to the resonator to form a plasma zone within the tube such that a halide coating is formed on the inner wall of the tube. The plasma generation and inner glass wall coating take place at a relatively low pressure and at a relatively low temperature.
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Aggarwal Ishwar D.
Busse Lynda E.
Ewing Kenneth J.
Harbison Barry B.
Lindsay Robert L.
The United States of Americas as represented by the Secretary of
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