Membrane deformable mirror for SUBARU adaptive optics

Details Membrane deformable mirror for SUBARU adaptive optics Membrane deformable mirror for SUBARU adaptive optics

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2201..762t&link_type=abstract

Proc. SPIE Vol. 2201, p. 762-767, Adaptive Optics in Astronomy, Mark A. Ealey; Fritz Merkle; Eds.

Physics

Optics

1

Scientific paper

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.

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