Heraeus Quarzglas Gmbh & Co Kg

Heraeus Noblelight Gmbh

Institut Fur Photonische Technologien

Institut Für Photonische Technologien E.v.

Mario Such

Martin Trommer

Andreas Langner

Gerhard Schoetz

Thomas Kayser

Gerhard Schötz

Walter Lehmann

Erich Arnold

Stephan Grimm

Volker Reichel

Franz-Josef Schilling

Johannes Kirchhof

Björn Roos

Klaus Zoltner

Christoph Söller

Mark Stamminger

Martin Leich

Florian Just

André Kalide

A method for producing a component with portions of a rare earth metal-doped quartz glass, an intermediate product containing voids and consisting of a SiOraw material doped with rare earth metal is introduced into a sinter mold the interior of which is bordered by a carbonaceous mold wall, and is melted therein into the component by gas pressure sintering at a maximum temperature above 1500&#xb0; C. A shield is arranged between the mold wall and the intermediate product. In order to indicate a modified gas pressure sintering method that ensures the production of rare earth metal-doped quartz glass with reproducible properties, a bulk material of amorphous SiOparticles with a layer thickness of at least 2 mm is used as the shield, the softening temperature thereof being at least 20&#xb0; C. higher than the softening temperature of the doped SiOraw material, and the bulk material being gas-permeable at the beginning of the melting of the intermediate product, and the bulk material sintering during melting into an outer layer that is gas-tight to a pressure gas.

Method for producing a component of rare earth metal-doped quartz glass

A UV lamp including a filter material of doped quartz glass is provided that effects a transparency as high as possible for operating radiation in the ultraviolet spectral range above 210 nm together with low transparency in the wavelength range below about 190 nm. The filter material of doped quartz glass includes at least 99 wt. % of SiOand AlO, wherein the AlOportion is in the range of 2 wt. % to 4 wt. The filter material has an edge wavelength at a wavelength below 190 nm and a spectral transmission of 80% mmor higher at a wavelength of 210 nm.

UV lamp and method for irradiating a surface, a liquid or a gas with UV radiation

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 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

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Graefenhainichen, Germany

Mario Such