Glass manufacturing – Processes of manufacturing fibers – filaments – or preforms – Process of manufacturing optical fibers – waveguides – or...
Patent
1996-06-26
1998-07-14
Hoffmann, John
Glass manufacturing
Processes of manufacturing fibers, filaments, or preforms
Process of manufacturing optical fibers, waveguides, or...
65DIG15, 423508, 423509, 501 40, C03B 500
Patent
active
057797579
ABSTRACT:
Hydrogen and/or carbon impurities are removed from chalcogenide or chalcoide glasses by the addition of a halide, such as TeCl.sub.4, to the batch composition. During melting of the batch composition, the metal halide reacts with the hydrogen and/or carbon impurities to form a hydrogen halide and/or carbon tetrahalide gas and a metal which becomes incorporated into the chalcogen-based glass. Useful halides include halides of sulfur, selenium, tellurium, polonium, or halides of a metal (such as aluminum, magnesium, zirconium, or a mixture thereof) that forms a stable oxide. Mixed metal halides may also be used. The glass melt is then distilled, outgassed, homogenized, fined, and annealed. An apparatus specially designed for making a fiber preform by the above process is also described. An annealed preform made by this method may be drawn into a low-loss fiber in the 2 .mu.m to 12 .mu.m range.
REFERENCES:
patent: 3006720 (1961-10-01), L'Heureux
patent: 4557914 (1985-12-01), Modone
patent: 4745090 (1988-05-01), Lucas
patent: 4801442 (1989-01-01), Nishii
patent: 5352639 (1994-10-01), Lucas
Aggarwal Ishwar D.
Nguyen Vinh Q.
Sanghera Jasbinder S.
Edelberg Barry
Hoffmann John
McDonnell Thomas E.
The United States of America as represented by the Secretary of
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