Process for producing synthetic quartz glass

Details Process for producing synthetic quartz glass Process for producing synthetic quartz glass

2011-08-09

2011-08-09

Daniels, Matthew J (Department: 1741)

Glass manufacturing

Processes of manufacturing fibers, filaments, or preforms

Process of manufacturing optical fibers, waveguides, or...

C065S414000, C065S385000, C065S017200, C065S017600

Reexamination Certificate

active

07992413

ABSTRACT:
An object of the invention is to provide a process for producing a synthetic quartz glass while taking account of a refractive index distribution remaining in the synthetic quartz glass; a jig for use in the synthetic-quartz-glass production process; and a synthetic quartz glass for an optical member, produced by the process. A process for producing a synthetic quartz glass, which comprises: depositing and growing fine quartz glass particles synthesized by flame hydrolysis of a glass-forming material on a rotating target to thereby form a porous quartz glass base of a substantially cylindrical shape; presintering the porous quartz glass base; and heating the presintered porous quartz glass base to a temperature not lower than the vitrification temperature to convert the base into a transparent glass, wherein in the step of conversion into a transparent glass, the porous quartz glass base is placed so as to make its growth axis vertical and a load is vertically imposed on the thus-placed porous quartz glass base.

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U.S. Appl. No. 11/853,891, filed Sep. 12, 2007, Hino.

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