Method of making fluorine/boron doped silica tubes
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United States of America Patent
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Apr 20, 1993
Grant Date -
N/A
app pub date -
Dec 16, 1991
filing date -
Dec 16, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a method of forming a glass tube doped with boron and fluorine. A B.sub.2 O.sub.3 -doped tubular porous preform is heated, and a fluorine-containing gas is flowed into its aperture. The temperature is sufficiently high to cause the fluorine-containing gas to decompose and form fluorine which dopes the preform. Also flowed into the aperture is a sufficient amount of BF.sub.3 to prevent fluorine from reacting with the B.sub.2 O.sub.3 in the porous preform and forming a B.sub.2 O.sub.3 -depleted region near the aperture surface. The particles are then fused to form a fluorine-containing dense glass tube.
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