The use of a high-order MEMS deformable mirror in the Gemini Planet Imager

Details The use of a high-order MEMS deformable mirror in the Gemini Planet Imager The use of a high-order MEMS deformable mirror in the Gemini Planet Imager

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spie.7931e...3p&link_type=abstract

MEMS Adaptive Optics V. Edited by Olivier, Scot S.; Bifano, Thomas G.; Kubby, Joel A. Proceedings of the SPIE, Volume 7931, p

Physics

Optics

Scientific paper

We briefly review the development history of the Gemini Planet Imager's 4K Boston Micromachines MEMS deformable mirror. We discuss essential calibration steps and algorithms to control the MEMS with nanometer precision, including voltage-phase calibration and influence function characterization. We discuss the integration of the MEMS into GPI's Adaptive Optics system at Lawrence Livermore and present experimental results of 1.5 kHz closed-loop control. We detail mitigation strategies in the coronagraph to reduce the impact of abnormal actuators on final image contrast.

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