Schott Glas

Other

Schott Ag

Rolf Martin

Jochen Alkemper

Andreas Menzel

Hartmut Bauch

Ute Natura

Thomas Schmiady

Frank Coriand

Gordon Von Der Goenna

Andreas Voitsch

Matthias Schmidt

Oliver Sohr

Wolfgang Schmidt

Roland Scholz

Thomas Schindelbeck

Frank Rudiger

Hraban Hack

Gordon Von Der Gönna

The invention relates to the loading of quartz glass objects with hydrogen in an annealing process in a furnace for improving the homogeneity of the refractive index and the laser resistance while, at the same time, maintaining a specified stress birefringence of each of the glass objects. Initially, the distribution of the refractive index, the stress birefringence, the distribution of the hydrogen and the differences in refractive index, which are to the equalized, are determined in the respective glass object, after which the hydrogen change, which is necessary for equalizing the refractive index, is determined. Furthermore, the annealing temperature and its holding time, as well as the hydrogen concentration and the hydrogen pressure in the furnace are adjusted to achieve a sufficiently equalized distribution of refractive index.

Method for charging quartz glass objects with hydrogen

A device for producing optically homogeneous, streak-free quartz glass bodies having a large diameter including a furnace or melting device having an inner chamber with a pair of openings opposite one another. One or more movable burners are displaceable into one of the openings and the respective glass body to be produced is located in the other opening. Both the burner and glass body are movably positioned. In the course of the production of the quartz glass body, a relative movement is effected in the axial and radial directions between the burner and the quartz glass body such that the distance from the burner outlet opening pertaining to the quartz glass body decreases as the distance from the burner to the X-X axis of the quartz glass body increases.

Device for generating an optically homogeneous, streak-free quartz glass body having a large diameter

A method produces homogenous quartz glass plates without streaks. The method is applied to starting quartz glass body which has an X&mdash;X geometrical axis and good refractive index homogeneity in its central area, and a refractive index homogeneity decreasing as the axis lies further from a central area. The body is divided into at least two concave parts by longitudinal cuts parallel to the axis once the central area has been processed out of the body. The parts are placed separately in corresponding molds and heated therein such that they are molded to form quartz glass plates having a desired thickness.

Quartz glass plates with high refractive index homogeneity

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Jena, Germany

Rolf Martin