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Proceedings Paper

Preliminary results of large-actuator-count MEMS DM development
Author(s): Michael A. Helmbrecht; Min He; Patrick Rhodes; Carl J. Kempf
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Paper Abstract

Compensating for atmospheric turbulence in meter-class telescopes and for free-space communications can require deformable mirrors (DM) with hundreds of actuators. Advances in high-contrast imaging techniques and increased telescope sizes require DMs mirrors with thousands of actuators [1]-[3]. In response to these needs, Iris AO has been developing a nearly 500-actuator DM and is conducting pathfinding research into 3000-actuator class DMs. This paper begins with an overview of the segmented DM design and describes improvements made to the DM over the prior year in the areas of speed, high-quality dielectric coatings, and snap-in prevention structures. The paper then describes the next-generation PTT489 DM design and fabrication process. Failure modes encountered during fabrication are presented as well as test methods to detect the failure modes. Preliminary yield data are presented for the fabrication process as well. The paper concludes with a view to the future showing pathfinding research into 3000-actuator DMs.

Paper Details

Date Published: 18 February 2010
PDF: 8 pages
Proc. SPIE 7595, MEMS Adaptive Optics IV, 75950C (18 February 2010); doi: 10.1117/12.845608
Show Author Affiliations
Michael A. Helmbrecht, Iris AO, Inc. (United States)
Min He, Iris AO, Inc. (United States)
Patrick Rhodes, Iris AO, Inc. (United States)
Carl J. Kempf, Iris AO, Inc. (United States)

Published in SPIE Proceedings Vol. 7595:
MEMS Adaptive Optics IV
Scot S. Olivier; Thomas G. Bifano; Joel A. Kubby, Editor(s)

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