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Proceedings Paper

Optical glasses and glass ceramics for large lenses and prisms
Author(s): Peter Hartmann; Hans F. Morian; Ralf Jedamzik
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Paper Abstract

Schott had delivered blanks for large lenses and prisms since many decades. Glass and glass ceramics objects with dimensions above 300 mm diameter or edge lengths will remain challenges for a glass manufacturer. This holds especially when the quality specifications exceed the standard level significantly. The developments in glass manufacturing allow casting of ZERODURR glass ceramic blanks up to about 1.5 m with homogeneities like that of high grade optical glass. This was utilized to test a convex mirror using a large Zerodur element in transmission providing the concave interferometer reference surface and the imaging aspherical lens simultaneously. Optical glass blocks of more than half a ton have been produced with outstanding internal quality. Although the manufacturing process is well controlled there are restrictions on the availability of such objects (glass types, long process times e.g.). The glass production process is presented pointing out its implications as a guideline for designers in order to avoid unneccessary time losses.

Paper Details

Date Published: 5 February 2002
PDF: 15 pages
Proc. SPIE 4411, Large Lenses and Prisms, (5 February 2002); doi: 10.1117/12.454884
Show Author Affiliations
Peter Hartmann, Schott Glas Mainz (Germany)
Hans F. Morian, Schott Glas Mainz (Germany)
Ralf Jedamzik, Schott Glas Mainz (Germany)

Published in SPIE Proceedings Vol. 4411:
Large Lenses and Prisms

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