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Appl Opt. 2008 Mar 20;47(9):1317-26.

Laboratory demonstration of accurate and efficient nanometer-level wavefront control for extreme adaptive optics.

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  • 1Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.


A 32 x 32 microelectricalmechanical systems mirror is controlled in a closed-loop adaptive optics test bed with a spatially filtered wavefront sensor (WFS), Fourier transform wavefront reconstruction, and calibration of references with a high-precision interferometer. When correcting the inherent aberration of the mirror, 0.7 nm rms phase error in the controllable band is achieved. When correcting an etched phase plate with atmospheric statistics, a dark hole 10(3) deeper than the uncontrollable phase is produced in the phase power spectral density. Compensation of the mirror's influence function is done with a Fourier filter, which results in improved loop convergence. Use of the spatial filter is shown to reduce the gain variability of the WFS in a quadcell configuration.

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