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2014
Conference Paper
Titel
Fabrication method for large off-axis aspherical metal mirrors
Abstract
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.