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Proceedings Paper

Spin-cast ZERODUR * mirror substrates of the 8 m class and lightweighted substrates for secondary mirrors
Author(s): Rudolf W. Mueller; Hartmut W. Hoeness
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Paper Abstract

The glass ceramic ZEROLXJR is excellently suited for the manufacture of mirror substrates hith is demonstrated by various astronomical telescope proj ects .The new spin casting tecbnique has been developed by ScFKYIT for the manufacture of thin monolithic mirror blanks exceeding 8 ra in diameter. This development resultel in sccirr obtaining the order for the manufacture of 4 meniscus shaped shells for the Very Large Telescope of the European Southern Observatoiy. The corresponding production facilities are currently being erected with the first casting Scheduled for the end of 1990 . Handling and suppcxtt of the huge blanks during the different process steps are the greatest challenges besides the spin-casting of about 50 t of glass . sciicrr has also performed considerable developmental work in the area of lightweighted ZEROLIJR mirror substrates which can be fabricated by applying various techniques.

Paper Details

Date Published: 1 August 1990
PDF: 10 pages
Proc. SPIE 1271, Adaptive Optics and Optical Structures, (1 August 1990); doi: 10.1117/12.20414
Show Author Affiliations
Rudolf W. Mueller, Schott Glaswerke (Germany)
Hartmut W. Hoeness, Schott Glaswerke (Germany)

Published in SPIE Proceedings Vol. 1271:
Adaptive Optics and Optical Structures
Joachim J. Schulte-in-den-Baeumen; Robert K. Tyson, Editor(s)

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