Interferometric nulling limits with tip-tilt-piston deformable mirrors and a pinhole spatial filter array

Brian A. Hicks; Supriya Chakrabarti; Timothy A. Cook

doi:10.1117/1.JATIS.1.1.019001

28 October 2014 Interferometric nulling limits with tip-tilt-piston deformable mirrors and a pinhole spatial filter array

Brian A. Hicks, Supriya Chakrabarti, Timothy A. Cook

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Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 1, Issue 1, 019001 (October 2014). https://doi.org/10.1117/1.JATIS.1.1.019001

Abstract

We explore the use of hexagonal segment tip-tilt-piston deformable mirrors alone and paired with pinhole spatial filter arrays for high-order wavefront correction of nulling interferometers used for visible light study of exoplanetary systems at 10⁷ to 10¹⁰ contrast within regions extending ∼0.1 to 6 arc s from a parent star. A similar system has been proposed using a single-mode fiber array as an alternative to using multiple deformable mirrors to correct both phase aberrations and balance electric field amplitude, the benefit being drastically reduced component and control complexity. Performance is compared using measured deformable mirror data for hexagonal arrays consisting of a number of rings N_R=2 to 18, emphasizing the trade between throughput and the additional contrast gained from suppressing wavefront errors introduced by the deformable mirror at spatial frequencies Λ≥N_R that are otherwise present in the image at corresponding field locations. Taking into account effects of loss of throughput and vignetting, the nulled signal-to-noise ratio is shown to improve for filtered systems in the outer portion of the field of view. Modeled performance shows no significant change in signal-to-noise in the inner field of view.

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Brian A. Hicks, Supriya Chakrabarti, and Timothy A. Cook "Interferometric nulling limits with tip-tilt-piston deformable mirrors and a pinhole spatial filter array," Journal of Astronomical Telescopes, Instruments, and Systems 1(1), 019001 (28 October 2014). https://doi.org/10.1117/1.JATIS.1.1.019001

Published: 28 October 2014

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KEYWORDS

Wavefronts

Spatial filters

Deformable mirrors

Signal to noise ratio

Image segmentation

Interferometry

Spatial frequencies

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