Heraeus Quarzglas Gmbh & Co Kg

Andreas Kaske

Stefan Ochs

Klaus Becker

One aspect relates to a method for producing an optical blank from synthetic quartz glass by vitrifying and shaping a porous, cylindrical SiOsoot body having a longitudinal axis, in a heating zone including a melt mold with bottom plate. The SiOsoot body vitrified in the heating zone at a vitrification temperature so as to form a full cylindrical, completely vitrified, transparent quartz glass body. Subsequently, the vitrified quartz glass body is shaped by softening in the melt mold at a softening temperature so as to form a viscous quartz glass mass which partly fills the volume of the melt mold, and cooling the quartz glass mass and removal from the melt mold so as to form the optical blank. During shaping in the melt mold, the full cylindrical quartz glass body is brought into contact by way of controlled supply with a centering means of the bottom plate.

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Bruchkoebel, Germany

Andreas Kaske