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Fabrication method for large off-axis aspherical metal mirrors

: Gebhardt, A.; Beier, M.; Scheiding, S.; Peschel, T.; Löscher, H.

Leach, R. ; European Society for Precision Engineering and Nanotechnology -EUSPEN-:
14th International Conference & Exhibition of the European Society of Precision Engineering and Nanotechnology 2014 : 2nd June-6th June 2014, Dubrovnik, Croatia; EUSPEN 2014
Bedford: Euspen, 2014
ISBN: 978-0-9566790-3-1
European Society for Precision Engineering and Nanotechnology (EUSPEN International Conference) <14, 2014, Dubrovnik>
Fraunhofer IOF ()

The paper describes the fabrication method of the Three-Mirror-Anastigmat (TMA) metal optics for the Polar Communication and Weather Mission for the Space Technology Development Program of the Canadian Space Agency. The project was realized under a subcontract from ABB Canada. The off-axis primary mirror with a clear aperture (CA) of 260 mm in diameter and the tertiary mirror with a CA of 320 mm in diameter were handled as freeform mirrors. The athermal design of the mirrors is based on the utilization of an aluminum-silicon alloy (AlSi40) as substrate material and electroless nickel (NiP) as a polishing layer for the mirror surfaces.