Abstract
Warping is a major concern in the use of aluminium as a material for large mirrors. The warping characteristics are influenced by:*the type of material, i.e. pure aluminium or some alloy*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].
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