Method for elongating and collapsing a blank made of quartz glass

Abstract

The invention relates to a method for the production of an optical component made of quartz glass by elongating a coaxial array, comprising of a hollow quartz glass cylinder that has an inner bore hole and that has been mechanically machined to the end volume and a core rod arranged inside the inner bore hole, wherein the coaxial array is fed to a heat zone with a predetermined forward feed motion and is softened zonewise therein and the optical component is drawn from the softened area, wherein an annular gap between the core rod and the hollow cylinder is collapsed. The invention aims at providing an economical method by means of which an optical component can be produced and which is characterized by a low break rate when the fibers are drawn. Depending on the outer diameter of the hollow cylinder D [in mm], the forward feed motion V [in mm/min] is maintained within a range complying with the following calculation Vmin=3000×(2/D)2 and Vmax=16000×(2/D)2.

Dependencies are inferred from the claim text.