Heraeus Quarzglas Gmbh & Co Kg

Institut Fur Photonische Technologien

Leibniz-Institut Fur Photonische Technologien E.v.

Institut Für Photonische Technologien E.v.

Gerhard Schoetz

Andreas Langner

Mario Such

Thomas Kayser

Richard Schmidt

Peter Bauer

Stephan Grimm

Karsten Braeuer

Walter Lehmann

Jan Vydra

Kay Schuster

Clemens Schmitt

Karsten Bräuer

Andreas Schultheis

Volker Reichel

Johannes Kirchhof

Paul Bödiger

Hardy Baierl

Marco Flach

Matthias Stecher

Jan Dellith

A method for producing rare earth metal-doped quartz glass includes the steps of (a) providing a blank of the rare earth metal-doped quartz glass, and (b) homogenizing the blank by softening the blank zone by zone in a heating zone and by twisting the softened zone along a rotation axis. Some rare earth metals, however, show a discoloration of the quartz glass, which hints at an unforeseeable and undesired change in the chemical composition or possibly at an inhomogeneous distribution of the dopants. To avoid this drawback and to provide a modified method which ensures the production of rare earth metal-doped quartz glass with reproducible properties, during homogenization according to method step (b), the blank is softened under the action of an oxidizingly acting or a neutral plasma.

Rare earth metal-doped quartz glass and method for producing the same

The invention relates to a process for producing SiOgranules by freezing and re-thawing an SiOsuspension, wherein a separation of liquid and sediment composed of agglomerated SiOparticles occurs in the course of thawing, the liquid removed is decanted and the residual moisture in the sediment is removed by a drying step with formation of the SiOgranules. According to the invention, an auxiliary comprising alkali metal-free bases in the form of nitrogen hydrides is added to the suspension to set the pH greater than 7.

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The invention relates to a method for producing a doped SiOslurry in which an SiOsuspension is brought into interaction with at least one doping solution, wherein the SiOsuspension and/or the doping solution act on one another in the form of an atomized spray, the average droplet diameter of which is in the range between 10 &#x3bc;m and 100 &#x3bc;m. The invention further relates to the use of an SiOslurry doped by the atomized spray method for the production of doped quartz glass, particularly for the production of laser-active quartz glass.

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

The invention relates to a method allowing cost-effective production of doped quartz glass, particularly laser-active quartz glass, that is improved with regard to the homogeneity of the doping material distribution, in that a suspension is provided comprising SiOparticles and an initial compound for at least one doping material in an aqueous fluid, the fluid being removed under formation of a doped intermediate product comprising particles of the doping material or particles of the precursor substance or the doping material, and the doped quartz glass is formed by sintering the doped intermediate product, wherein at least part of the particles of the doping material or the particles of the precursor substance of the same is generated in the suspension as a precipitate of a pH-value-controlled precipitation reaction of the initial compound.

Method for producing doped quartz glass

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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Aschaffenburg, Germany

Gerhard Schoetz