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For about 20 years SCHOTT has been supplying the glass ceramic
ZERODUR, a material with a thermal expansion of virtually zero.
ZERODUR is excellently suited for the manufacture of mirror
substrates for astronomical telescopes.
SCHOTT has accumulated substantial experience in melting and
processing of this material. New techniques, such as spin-casting,
have been developed by SCHOTT for the manufacture of thin monolithic
mirror blanks exceeding 8 m in diameter. These developments resulted
in SCHOTT obtaining the order for the manufacture of 4 meniscus
shaped shells for the Very Large Telescope of the European Southern
Observatory. The corresponding production facilities are currently
being erected with the first casting scheduled for the end of 1990.
SCHOTT has also performed considerable developmental work in the
area of lightweighted ZERODUR mirror substrates which can be
fabricated by applying one or a combination of the following
techniques: forming of the lightweighted structure during casting,
fusion of individual components to a total structure and
lightweighting of a massive block by various machining methods.
Rudolf W. Mueller,Hartmut W. Hoeness, andThomas A. Marx
"Spin-cast Zerodur mirror substrates of the 8-m class and lightweighted substrates for secondary mirrors", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); https://doi.org/10.1117/12.19242
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Rudolf W. Mueller, Hartmut W. Hoeness, Thomas A. Marx, "Spin-cast Zerodur mirror substrates of the 8-m class and lightweighted substrates for secondary mirrors," Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); https://doi.org/10.1117/12.19242