MEMS adaptive optics for the Gemini Planet Imager: control methods and validation
2007
The Gemini Planet Imager (GPI) Adaptive Optics system will use a high-order MEMS deformable mirror for
phase compensation. The MEMS mirror will be used in a Woofer-Tweeter configuration, with a frequency-domain
based splitting of the phase between the two mirrors. Precise wavefront control depends on the ability
to command them MEMS to make the exact phase desired. Non-linearities in the MEMS may prevent this.
We determine that influence-function pre-compensation can remove most, but not all, open-loop error. We
use simulation and a simulation of a non-linear MEMS to address the issue of how much non-linearity can be
tolerated in closed-loop by GPI.
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