C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
32/23, 117/74
C03B 37/018 (2006.01) C03B 20/00 (2006.01) C03B 37/012 (2006.01) C03B 37/014 (2006.01) C23C 16/513 (2006.01) G02B 6/00 (2006.01)
Patent
CA 1258206
METHOD AND APPARATUS FOR FORMING DOPED OPTICAL PREFORMS ABSTRACT OF THE DISCLOSURE An optical fiber preform is formed by plasma chemical vapor deposition utilizing a plasma torch that includes a chamber into which a plasma starting gas, such as argon, is introduced and converted to a plasma by application of high frequency electromagnetic energy. A suitable entry port is provided in the torch chamber to allow dopant material in solid form to be introduced directly into the plasma for vaporization or ionization. The dopant material passes into a lower temperature region where gaseous silica precursor gases are intro- duced to undergo reaction in the presence of the vapor- ized dopant to form appropriately doped silica particles for deposition onto a substrate. Solid dopants of low volatility or vapor pressure may be used as dopants which could not otherwise be used in vapor deposition processes. The absence of hydrogen in the reaction dynamics results in a preform having greatly reduced hydroxyl ion content. If desired, a high-purity starting glass, rather than the precursor gases, can be introduced directly into the plasma to form the appropriately doped material.
536371
Polaroid Corporation
Smart & Biggar
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