Patent ID: 7849711
Filing Date: 2010-12-14
Classification: B82Y,C03B,C03C,G03F,G21K

Abstract:
1. A method for preparing a titania-doped quartz glass, comprising the steps of subjecting a silicon source gas and a titanium source gas to flame hydrolysis with the aid of a combustible gas and a combustion-supporting gas in a furnace, to thereby form synthetic silica fine particles, depositing the silica fine particles on a rotating target, and concurrently melting and vitrifying the deposited silica into titania-doped quartz glass, wherein the target is rotated at a speed of at least 5 rpm, the flow rates of the silicon source gas, the titanium source gas, the combustible gas and the combustion-supporting gas are controlled to a variation within ±1%/hr, and the temperatures of the gases fed into or taken out of the furnace and the ambient atmosphere surrounding the furnace are controlled to a variation within ±2.5° C.