Polychromatic Compensation of Propagated Aberrations for High-Contrast Imaging

Details Polychromatic Compensation of Propagated Aberrations for High-Contrast Imaging Polychromatic Compensation of Propagated Aberrations for High-Contrast Imaging

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...666..609p&link_type=abstract

The Astrophysical Journal, Volume 666, Issue 1, pp. 609-625.

Physics

Optics

4

Instrumentation: Adaptive Optics, Instrumentation: High Angular Resolution

Scientific paper

We describe the influence of Fresnel propagation in apodized-pupil coronagraphs and introduce a methodology to compensate for propagated wavefront aberrations. We start from the Fresnel integral and derive an analytical closed form for the propagated field at an arbitrary distance from a pupil. In a second part, we show that the propagation of the coronagraphic term can be neglected with sufficiently oversized optics. Then we derive a λ-Fourier expansion of the aberration at an arbitrary plane in the optical train of a telescope. Finally, we present a series of wavefront actuators, based on multiple deformable mirrors, that possess adequate chromatic behavior to correct for the dominant terms of this expansion.

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