Heraeus Quarzglas Gmbh & Co Kg

Karsten Braeuer

Jan Vydra

Gerhard Schoetz

Peter Bauer

Andreas Langner

Michael Huenermann

Clemens Schmitt

Richard Schmidt

Marco Flach

Matthias Stecher

A known refraction-sensitive optical fiber comprises a core zone with an index of refraction n, a jacket zone surrounding the core zone, said jacket zone having an index of refraction n, and an annular zone made of quartz glass doped with fluorine, said annular zone surrounding the jacket zone and having an index of refraction n, where n&#x3c;n&#x3c;n. With this as a starting point, an optical fiber is to be provided that is characterized by high refraction-sensitivity, good spliceability and compatibility, and a method is to be provided for cost-effective manufacture of such a fiber. With regard to the method, this object is accomplished according to the invention in that the quartz glass of the annular zone () is produced in a plasma deposition process on the outside in which an annular zonal layer made of the quartz glass doped with fluorine is produced on a substrate body (), said layer having a layer thickness of at least 1 mm and an index of refraction n&#x3c;1.4519 relative to the D line of the sodium vapor lamp.

Refraction-sensitive optical fiber, quartz glass tube as a semi-finished product for the manufacture-thereof and method for the manufacture of the fiber

To improve a known method for making a quartz glass tube as a semifinished product for the manufacture of optical fibers, the tube comprising an inner fluorine-doped quartz glass layer and an outer quartz glass layer, so as to achieve inexpensive manufacture and improved dimensional stability of the quartz glass tube, it is suggested according to the invention that the quartz glass of the inner layer should be produced in a first plasma deposition process with formation of an inner layer having a wall thickness of at least 1.5 mm, with a fluorine content of at least 1.5% by wt. being set in the quartz glass, and that the quartz glass of the outer layer should be produced in a second plasma deposition process and deposited directly or indirectly on the inner layer with formation of a composite tube, and that the composite tube should be elongated into the quartz glass tube.

Quartz glass tube as a semifinished product for preform and fiber manufacture, and method for making the quartz glass tube

Cylindrical optical components of quartz glass are known, which have an inner zone made of an inner zone glass, which extends in the direction of the longitudinal axis and is surrounded by a jacket zone made of a jacket zone glass, the average wall thickness thereof varying at least over a part of its length in the direction of the longitudinal axis of the component. The aim of the invention is to provide a method that allows a simple and cost-effective production of such an optical component from quartz glass. A method is proposed according to the invention, comprising the following method steps: (a) providing a first parison made of an inner zone glass, which has a first contact surface on the end face, said contact surface having a conical external contour; (b) providing a second parison from the jacket zone glass; (c) embedding the contact surface with a conical external contour into the jacket zone glass and welding the contact surface to the jacket zone glass, thereby forming a composite parison which has a cone-shaped inner zone area of inner zone glass in a contact area, said inner zone area being surrounded by a jacket zone area having the shape of an inner cone; and (d) elongation of the composite parison to form the optical component or a preproduct of the component.

Method for producing a cylindrical optical component of quartz glass and optically active component obtained by said method

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Bruchkoebel, Germany

Karsten Braeuer