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Optical Wavefront Analysis of Thermally Cycled 500 mm Metallic Mirrors

Published online by Cambridge University Press:  12 April 2016

L. Noethe ,
F. Franza ,
P. Giordano  and
R. Wilson
L. Noethe
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, D-8046 Garching
F. Franza
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, D-8046 Garching
P. Giordano
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, D-8046 Garching
R. Wilson
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Str. 2, D-8046 Garching

Extract

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Warping is a major concern in the use of aluminium as a material for large mirrors. The warping characteristics are influenced by:

  1. * the type of material, i.e. pure aluminium or some alloy

  2. * the type of fabrication, i.e. cast, rolled or forged.

So far there is little data available on the warping characteristics of aluminium mirrors. Therefore ESO has tested the warping behaviour of 18 aluminium mirrors under thermal cycling conditions with a glass ceramic mirror, which has not been cycled, as a reference mirror. The set of 500 mm mirrors selected for this experiment is described in [1].

Type
II. Mirrors and Domes
Information
International Astronomical Union Colloquium , Volume 79: Very Large Telescopes, their Instrumentation and Programs , 1984 , pp. 67 - 74
Copyright
Copyright © ESO 1984

References

1. Mischung, K.N., “ESO’s New Technology Telescope (NTT), Metallic Primary Mirror Project”, Proc. of IAU Conference No. 79, ESO Garching, April 1984.Google Scholar