8 February 2008 MEMS adaptive optics for the Gemini Planet Imager: control methods and validation
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Abstract
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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Lisa A. Poyneer, Lisa A. Poyneer, Daren Dillon, Daren Dillon, "MEMS adaptive optics for the Gemini Planet Imager: control methods and validation", Proc. SPIE 6888, MEMS Adaptive Optics II, 68880H (8 February 2008); doi: 10.1117/12.772754; https://doi.org/10.1117/12.772754
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