Patent ID: 6748768
Filing Date: 2004-06-15
Classification: C03B

Abstract:
A method for doping silica Soot with fluorine during laydown, comprising the steps of:providing a bait rod; providing a burner, the burner emitting a reactant flame; providing at least one first gas-feed separated from the burner, the gas-feed being an fluid communication with a source for supplying a first jet of fluorine based gases from the source; depositing on a radial surface of the bait rod a layer of silica soot on the bait rod by vaporizing a silica producing gas emitted from the burner within the reactant flame of the burner; and supplying the first jet of fluorine-based gases to the silica soot deposited onto the bait rod via the first gas-feed subsequent to vaporizing at least a portion of the silica producing gas within the reactant flame of the burner.