Amplitude and phase correction for high-contrast imaging using Fourier decomposition

Details Amplitude and phase correction for high-contrast imaging using Fourier decomposition Amplitude and phase correction for high-contrast imaging using Fourier decomposition

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005spie.5905..368g&link_type=abstract

Techniques and Instrumentation for Detection of Exoplanets II. Edited by Coulter, Daniel R. Proceedings of the SPIE, Volume 590

Physics

Optics

1

Scientific paper

Conventional adaptive optics systems correct the wavefront by adjusting a deformable mirror based on measurements of the phase aberration taken in a pupil plane. The ability of this technique, known as phase conjugation, to correct aberrations is normally limited by the maximum spatial frequency of the DM. In this paper we show that conventional phase conjugation is not able to achieve the dark nulls needed for high-contrast imaging. Linear combinations of high frequencies in the aberration at the pupil plane "fold" and appear as low frequency aberrations at the image plane. After describing the frequency folding phenomenon, we present an alternative optimized solution for the shape of the deformable mirror based on the Fourier decomposition of the effective phase and amplitude aberrations.

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