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Proceedings Paper

Characterizing the potential of MEMS deformable mirrors for astronomical adaptive optics
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Paper Abstract

Current high-contrast "extreme" adaptive optics (ExAO) systems are partially limited by deformable mirror technology. Mirror requirements specify thousands of actuators, all of which must be functional within the clear aperture, and which give nanometer flatness yet micron stroke when operated in closed loop.1 Micro-electrical mechanical-systems (MEMS) deformable mirrors have been shown to meet ExAO actuator yield, wavefront error, and cost considerations. This study presents the performance of Boston Micromachines' 1024-actuator continuous-facesheet MEMS deformable mirrors under tests for actuator stability, position repeatability, and practical operating stroke. To explore whether MEMS actuators are susceptible to temporal variation, a series of long-term stability experiments were conducted. Each actuator was held fixed and the motion over 40 minutes was measured. The median displacement of all the actuators tested was 0.08 nm surface, inclusive of system error. MEMS devices are also appealing for adaptive optics architectures based on open-loop correction. In experiments of actuator position repeatability, 100% of the tested actuators returned repeatedly to their starting point with a precision of < 1 nm surface. Finally, MEMS devices were tested for maximum stroke achieved under application of spatially varying one-dimensional sinusoids. Given a specified amplitude in voltage, the measured stroke was 1 μm surface at the low spatial frequencies, decreasing to 0.2 μm surface for the highest spatial frequency. Stroke varied somewhat linearly as inverse spatial frequency, with a flattening in the relation at the high spatial frequency end.

Paper Details

Date Published: 28 June 2006
PDF: 12 pages
Proc. SPIE 6272, Advances in Adaptive Optics II, 627221 (28 June 2006); doi: 10.1117/12.672470
Show Author Affiliations
Katie M. Morzinski, National Science Foundation Ctr. for Adaptive Optics (United States)
UCO/Lick Observatory, Univ. of California, Santa Cruz (United States)
Julia W. Evans, National Science Foundation Ctr. for Adaptive Optics (United States)
Lawrence Livermore National Lab. (United States)
Univ. of California, Davis (United States)
Scott Severson, National Science Foundation Ctr. for Adaptive Optics (United States)
UCO/Lick Observatory, Univ. of California, Santa Cruz (United States)
Bruce Macintosh, National Science Foundation Ctr. for Adaptive Optics (United States)
UCO/Lick Observatory, Univ. of California, Santa Cruz (United States)
Lawrence Livermore National Lab. (United States)
Daren Dillon, National Science Foundation Ctr. for Adaptive Optics (United States)
UCO/Lick Observatory, Univ. of California, Santa Cruz (United States)
Don Gavel, National Science Foundation Ctr. for Adaptive Optics (United States)
UCO/Lick Observatory, Univ. of California, Santa Cruz (United States)
Claire Max, National Science Foundation Ctr. for Adaptive Optics (United States)
UCO/Lick Observatory, Univ. of California, Santa Cruz (United States)
Dave Palmer, National Science Foundation Ctr. for Adaptive Optics (United States)
Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 6272:
Advances in Adaptive Optics II
Brent L. Ellerbroek; Domenico Bonaccini Calia, Editor(s)

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