High-frequency folding and optimal phase conjugation for high-contrast adaptive optics

Details High-frequency folding and optimal phase conjugation for high-contrast adaptive optics High-frequency folding and optimal phase conjugation for high-contrast adaptive optics

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5490.1438g&link_type=abstract

Advancements in Adaptive Optics. Edited by Domenico B. Calia, Brent L. Ellerbroek, and Roberto Ragazzoni. Proceedings of the SPI

Physics

Optics

Scientific paper

Conventional adaptive optics methods use phase conjugation based on measurements of the phase aberrations at the pupil plane. The measurements are typically done using a Shack-Hartmann sensor sampling at spatial frequencies determined by the spatial frequency limitations of the deformable mirror. The work presented here shows that the nulling needed for high contrast imaging cannot be achieved using such a methodology. Linear combinations of high frequencies in the aberration at the pupil plane "fold" and appear as low frequency aberrations at the image plane. We present an optimized solution for the shape of the deformable mirror based on the Fourier decomposition of the effective phase aberration.

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