Schott Ag

Martin Schaefer

Volker Seibert

Thomas Westerhoff

Ralf Jedamzik

Ralf Reiter

Marco Weisenburger

A mirror, a mirror substrate, a method for producing are provided. The mirror substrate is made of a material having a coefficient of mean linear thermal expansion of less than or equal to 1*10/K. The mirror substrate includes at least one feature selected from a group consisting of: a ratio of a lateral dimension to a maximum thickness of at least 100, a ratio of the lateral dimension to the maximum thickness of at least 150, a ratio of the lateral dimension to the maximum thickness of at least 200, a ratio of the lateral dimension to the maximum thickness of at least 300, a weight per unit area of 100 kg/mor less, a weight per unit area of 50 kg/mor less, a weight per unit area of 30 kg/mor less, a weight per unit area of 15 kg/mor less, a mirror surface with a roughness (R) of at most 3.5 μm, and a mirror surface with a roughness (R) of less than 1.2 μm.

Mirror and mirror substrate with high aspect ratio, and method and means for producing such a mirror substrate

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.

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Mainz-Kostheim, Germany

Martin Schaefer