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Proceedings Paper

Using 50-mm electrostatic membrane deformable mirror in astronomical adaptive optics
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Paper Abstract

Membrane micro-machined deformable mirrors (MMDM) feature low cost, low power consumption, small size and absence of hysteresis. Interested in using such a device for the adaptive optics system at the SOAR 4.1-m telescope, we evaluated the performance of a 79-channel 50-mm (pupil size 35mm) MMDM from OKO Technologies. The measured influence functions match the solutions of the Poisson equation with a fixed boundary. The maximum achievable modulation of the local radius of curvature of the mirror is +-25 m. Simulations of the AO system with this MMDM show that the curvature saturation becomes apparent even at a median seeing of 0.67". A new control algorithm that re-distributes the signals of saturated electrodes to adjacent ones significantly improves compensation under conditions of partial saturation. Limited curvature range and pupil diameter restrict the suitability of MMDM technology to moderate order AO systems at telescopes with diameter of up to 3m.

Paper Details

Date Published: 25 October 2004
PDF: 6 pages
Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); doi: 10.1117/12.550044
Show Author Affiliations
Andrei Tokovinin, Cerro Tololo Inter-American Observatory (Chile)
Sandrine Thomas, Cerro Tololo Inter-American Observatory (Chile)
Gleb Vdovin, Technische Univ. Delft (Netherlands)

Published in SPIE Proceedings Vol. 5490:
Advancements in Adaptive Optics
Domenico Bonaccini Calia; Brent L. Ellerbroek; Roberto Ragazzoni, Editor(s)

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