Physics – Optics
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apopt..47.1317p&link_type=abstract
Applied Optics IP, vol. 47, Issue 9, pp.1317-1326
Physics
Optics
6
Active Or Adaptive Optics, Wave-Front Sensing, Micro-Optical Devices, Astronomical Optics
Scientific paper
A 32×32 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 103 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.
Dillon Daren
Macintosh Bruce Alan
Poyneer Lisa A.
Thomas Sandrine
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