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Proceedings Paper

Eight-inch f5 deformable magnetic-membrane mirror
Author(s): Matthew Angel
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Paper Abstract

We demonstrate a method for producing a large, inexpensive, highly curved deformable mirror by stretching a thin polymer membrane coated with a reflective, magnetic material over a rigid frame. The membrane tension, thickness profile, and the transmembrane pressure differential determine the curvature of the mirror, while a computer-controlled electromagnet array deforms the membrane, both to correct the figure and to compensate for an aberrated wavefront. A telescope with an eight-inch f5 magnetic-membrane primary mirror and an adaptive-optics wavefront-measurement-andcontrol system was built and tested. The versatility, high surface quality, large actuator stroke, and low cost-to-aperture ratio of this design suggest that magnetic-membrane mirrors can be used to overcome many of the limitations of both deformable and static mirrors made from solid materials.

Paper Details

Date Published: 6 July 2006
PDF: 9 pages
Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 62732A (6 July 2006); doi: 10.1117/12.669700
Show Author Affiliations
Matthew Angel, MIT Lincoln Lab. (United States)

Published in SPIE Proceedings Vol. 6273:
Optomechanical Technologies for Astronomy
Eli Atad-Ettedgui; Joseph Antebi; Dietrich Lemke, Editor(s)

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