Plasma deposition process for producing an optical preform with a cladding glass layer of fluorine-doped quartz glass
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United States of America Patent
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Nov 8, 2016
Grant Date -
Jul 31, 2014
app pub date -
Jul 26, 2012
filing date -
Jul 27, 2011
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Abstract
In plasma deposition processes for producing an optical preform according to the POD method, a cladding glass layer composed of fluorine-doped quartz glass is produced by means of a plasma torch on a cylindrical substrate body composed of quartz glass, said substrate body rotating about the longitudinal axis thereof. In this case, the plasma torch performs a reversing relative movement between two turning points (A; B) along the substrate body. In order, proceeding therefrom, to achieve a high fluorine doping in conjunction with a dopant distribution that is as uniform as possible axially, the invention proposes that a heat element has a heating effect on the region of one turning point (A; B) when the plasma torch is situated in the region of the other turning point (B; A).
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