Heraeus Quarzglas Gmbh & Co Kg

Peter Bauer

Andreas Langner

Clemens Schmitt

Richard Schmidt

Jan Vydra

Gerhard Schoetz

Karsten Bräuer

Andreas Schultheis

Karsten Braeuer

Oliver Ganz

Ralph Sattmann

Michael Huenermann

Gerhard Schötz

Rene Sowa

Norbert Cibis

Matthias Stecher

Paul Bödiger

Marco Flach

A quartz glass tube as a semi-finished product for an optical component that has an inner bore extending along a tube center axis for the acceptance of a core rod and a tube wall limited by an inner casing surface and an outer casing surface is already known; within said tube wall an inner region made of a first quartz glass and an outer region made of a second quartz glass with a different index of refraction surrounding the inner region contact one another at a contact surface which runs around the center axis. In order to provide a quartz glass on this basis that facilitates the production of optical components for special applications such as laser-activated optical components in wand or fiber form, the invention states that the contact surface has a non-round course in the radial cross-section and the inner casing surface has a circular course.

Quartz glass tube as a semi-finished product for an optical component

The invention relates to a plasma deposition process for producing an optical preform, which is characterized by a cladding glass layer having a non-round internal cross-section together with high fluorine doping and axially and radially specified dopant distribution, which in the simplest case is as uniform as possible. For this purpose, a two-stage method is proposed, wherein a substrate body having a non-round cross-section is first reshaped into a coated substrate body having a circular cross-section in that a POD filling layer made of quartz glass having the nominal fluorine concentration is deposited onto a present filling surface and rounded by grinding, and then in the second stage of the method a POD sheathing glass layer made of fluorine-doped quartz glass and having a circular-ring-shaped cross-section is deposited.

Method for producing an optical preform with a POD cladding glass layer

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

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

The production of an optical component from quartz glass, by elongation of a coaxial arrangement of a core rod and a hollow cylinder of a given length, is known. The arrangement is thus introduced into a heating zone with a vertical orientation, such that the lower end begins to partly soften and the component is drawn downwards from the softened part. The hollow cylinder has an inner passage, provided with a restriction in the region of the lower end thereof, on which the core rod is supported. Several methods are disclosed for formation of the restriction in which the inner passage () is mechanically machined to a final dimension and, in one version of the method, the restriction in the inner passage () is generated by means of softening the lower end face of the hollow cylinder, swaged against a tool and thus folded inwards with formation of a peripheral bead ring.

Method for production of an optical component made from quartz glass

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Seligenstadt, Germany

Peter Bauer