Wavefront Sensing, Active and Adaptive Optics, and Control Systems

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

[+] Author Affiliations
Brian A. Hicks

NASA Postdoctoral Program Fellow, Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, Maryland 20771, United States

Supriya Chakrabarti

University of Massachusetts Lowell, Center for Atmospheric Research, 600 Suffolk Street, Third Floor, Lowell, Massachusetts 01854, United States

Timothy A. Cook

University of Massachusetts Lowell, Center for Atmospheric Research, 600 Suffolk Street, Third Floor, Lowell, Massachusetts 01854, United States

J. Astron. Telesc. Instrum. Syst. 1(1), 019001 (Oct 28, 2014). doi:10.1117/1.JATIS.1.1.019001
History: Received October 31, 2013; Revised February 14, 2014; Accepted February 26, 2014
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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 NR=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 ΛNR 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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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Brian A. Hicks ; Supriya Chakrabarti and Timothy A. Cook
"Interferometric nulling limits with tip-tilt-piston deformable mirrors and a pinhole spatial filter array", J. Astron. Telesc. Instrum. Syst. 1(1), 019001 (Oct 28, 2014). ; http://dx.doi.org/10.1117/1.JATIS.1.1.019001


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