Middle infra-red hollow optical fibres and a method for forming them
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United States of America Patent
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Oct 18, 1988
Grant Date -
N/A
app pub date -
Jan 7, 1986
filing date -
Jun 5, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hollow optical fibre waveguide for low loss transmission at mid infra-red wavelengths, and particularly in the region of the CO.sub.2 laser wavelength of 10.6 microns, is made of a germanium dioxide based glass, preferably comprising not less than 80 wt. % GeO.sub.2 and not more than 20 wt. % PbO, and has at least the inner surface of the hollow glass fibre devitrified and/or provided with a thin germanium lining. This change at the inner surface of the hollow fibre reduces transmission loss at the wavelengths of interest, and is effected by heat treatment at a temperature of at least 400.degree. C., simultaneously with exposure of the inner surface to a reducing atmosphere if a thin germanium layer is required at the inner surface.
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