Abstract
We present a high accuracy Micro-Electro-Mechanical-System (MEMS) deformable mirror (DM) control algorithm currently implemented in the real-time control interface of the Subaru Coronagraphic Extreme Adaptive Optics project (SCExAO). MEMS DMs are an attractive DM technology for Extreme-AO (ExAO) because they offer unprecedented actuator density and actuator counts. ExAO applications require a DM model capable of reproducing a phase map with a precision of few nm rms. The algorithm relies (i) on a physical model of the actuators and the membrane and (ii) on the optimization of DM coefficients and geometrical coefficients, and could be adopted as an open-loop control solution for future MOAO or ExAO ELTs instruments. During the initial tests performed at the UVic AO Lab, the performance of the model reached an open-loop error equal to 7.3% of the rms of the desired phase (1.6% of the peak-to-valley (PV) of the desired phase) with Kolmogorov type wavefronts.
Original language | English (US) |
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State | Published - 2011 |
Externally published | Yes |
Event | 2nd International Conference on Adaptive Optics for Extremely Large Telescopes, AO for ELT 2011 - Victoria, BC, Canada Duration: Sep 25 2011 → Sep 30 2011 |
Other
Other | 2nd International Conference on Adaptive Optics for Extremely Large Telescopes, AO for ELT 2011 |
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Country/Territory | Canada |
City | Victoria, BC |
Period | 9/25/11 → 9/30/11 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials