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Proceedings Paper

Membrane deformable mirror for SUBARU adaptive optics
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Paper Abstract

The prototype membrane deformable mirror for the Cassegrain adaptive optics of SUBARU (Japanese 8 m telescope under construction at Mauna Kea). It was made of 2 micrometers thick nitrocellulose, 50.8 mm in diameter, and had an effective area of 25 mm in diameter. The surface was coated with aluminum that acts both as a reflective surface and as an electrode. The deformation of mirror surface was produced by applying electrostatic force between the membrane and adjacent multi-element electrodes. The mirror surface quality was 0.03 (lambda) rms at 0.632 micrometers in wave front with and without applying bias voltages. The strong resonance was observed under vacuum condition at 1.6 kHz, but disappeared when the inner pressure was controlled at about 10 Torr, for which the mirror bandwidth became 3.3 kHz at 45 deg phase delay.

Paper Details

Date Published: 31 May 1994
PDF: 6 pages
Proc. SPIE 2201, Adaptive Optics in Astronomy, (31 May 1994); doi: 10.1117/12.176110
Show Author Affiliations
Hideki Takami, Communications Research Lab. (United States)
Masanori Iye, National Astronomical Observatory (Japan)

Published in SPIE Proceedings Vol. 2201:
Adaptive Optics in Astronomy
Mark A. Ealey; Fritz Merkle, Editor(s)

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