14 September 2005 Amplitude and phase correction for high-contrast imaging using Fourier decomposition
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Abstract
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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Amir Give'on, Amir Give'on, N. Jeremy Kasdin, N. Jeremy Kasdin, Robert J. Vanderbei, Robert J. Vanderbei, Yoav Avitzour, Yoav Avitzour, } "Amplitude and phase correction for high-contrast imaging using Fourier decomposition", Proc. SPIE 5905, Techniques and Instrumentation for Detection of Exoplanets II, 590516 (14 September 2005); doi: 10.1117/12.617383; https://doi.org/10.1117/12.617383
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