Telescope Design In The German Infrared Laboratory (GIRL)

Rudolf Schlegelmilch

doi:10.1117/12.935890

22 September 1983 Telescope Design In The German Infrared Laboratory (GIRL)

Rudolf Schlegelmilch

Proceedings Volume 0414, Optical Engineering for Cold Environments; (1983) https://doi.org/10.1117/12.935890
Event: 1983 Technical Symposium East, 1983, Arlington, United States

Abstract

The mirrors of the 40 cm GIRL telescope cooled by superfluid helium will consist of glass ceramic Zerodur. The poor thermal conductivity of this material called for unusual cooling procedures, the details of which have been investigated in laboratory tests. The assembly of the mirrors at the aluminium base occurs via an intermediate invar structure which is suited to maintain the optical quality after cooling. Special expansion compensators guarantee equal focussing conditions at laboratory and cryogenic temperatures. Vibration tests of the engineering model have proved the dimensional stability of critical components. The infrared reflectivity of different mirror desposits were measured under cold conditions.

Citation Download Citation

Rudolf Schlegelmilch "Telescope Design In The German Infrared Laboratory (GIRL)", Proc. SPIE 0414, Optical Engineering for Cold Environments, (22 September 1983); https://doi.org/10.1117/12.935890

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