Schott Ag

Ralf Jedamzik

Hauke Esemann

Thorsten Doehring

Eva Hoelzel

Ina Mitra

Clemens Kunisch

Volker Hagemann

Volker Seibert

Axel Engel

Steffen Grün

Thoralf Johansson

Johann Faderl

Peter Naß

Ralf Reiter

Thomas Lifka

Thomas Westerhoff

Sebastian Leukel

Gerhard Westenberger

Martin Schaefer

Peter Fischer

Uwe Petzold

Hölzel Eva

Thorsten Döhring

An imaging system includes at least one laser light source having a wavelength in the visible spectral range and a beam guidance element with high solarization resistance at high beam power densities. The invention also relates to the use of the imaging system, in particularly in projectors and in material processing.

Imaging system comprising beam guidance element with high solarization resistance in the visible spectral range

A glass-ceramic component is provided that has a low average coefficient of thermal expansion (CTE) and a high CTE homogeneity. The use of such a component and a process for producing such a component are also provided.

Highly homogeneous glass-ceramic component

A method is provided for determining the thermal expansion of a low thermal expansion material with very high accuracy of at most +/&#x2212;3 ppb/K or less and/or with a reproducibility of at most +/&#x2212;1 ppb/K or less. A measuring device is also provided that includes an advanced push rod dilatometer.

High-precision method for determining thermal expansion

The present disclosure relates to a component for low-temperature applications, a process for producing such a component, and the use thereof.

Component for low-temperature applications

The invention generally relates to manufacturing or providing of glass or glass ceramic products. The invention is based on the object to allow for providing glass or glass ceramic products having very accurately characterized thermo-mechanical properties. For this purpose, a deformation of the glass or glass ceramic material is measured at least twice as a function of time with different rates of change in temperature or a mechanical stress. Based on the measurements, relaxation times and weighting factors are determined by modelling. Then, based on the relaxation times and weighting factors related to the distribution of relaxation processes occurring in the product, a time-delayed change of a temperature-dependent or stress-dependent physical quantity, such as thermal expansion or refractive index, is calculated as a function of a predefined temperature change or stress change. The invention is used for selecting during manufacturing suitable glass products exhibiting selected time-delayed properties.

Method for determining time-delayed changes of temperature-dependent or stress-dependent physical quantities of a glass or a glass ceramic

A monolithic substrate of glass or glass ceramics and methods for manufacturing are provided, where the substrate has a lightweight structure. The lightweight structure includes recesses that are delimited by webs, such webs forming tetragonal or four-corner-shaped pockets. Due to the lightweight structure, the weight of the substrate can be significantly reduced, and at the same time a high rigidity can be ensured. The substrate can be used as a mirror support or a mirror and can be employed terrestrially and/or extra-terrestrially.

Substrate with lightweight structure

A lithium-aluminosilicate glass ceramic is transformed by a suitable heat treatment into a glass ceramic comprising at least 80 vol.-% of keatite mixed crystals. This may be utilized for the preparation of optical or mechanical high-precision parts having a high temperature resistance, a good stability and compatibility with components consisting of metals having a small coefficient of thermal expansion based on nickel and iron, such as Invar&#xae;.

Lithium-aluminosilicate glass ceramic with high keatite content and structural member made thereof

A process for forming glass or glass ceramics is disclosed, wherein a glass ceramics form () is made from a starting glass by molding, which is transformed by a heat treatment into a keatite glass ceramic comprising predominantly keatite mixed crystals. With such a keatite glass ceramics form () formed bodies can be prepared from blank parts by sagging under gravity force at a temperature above the glass transition temperature of the blank part () (FIG.).

Method for the forming of glass or glass ceramics

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Griesheim, Germany

Ralf Jedamzik