Special Section on WFIRST-AFTA Coronagraphs

Hybrid Lyot coronagraph for wide-field infrared survey telescope-astrophysics focused telescope assets: occulter fabrication and high contrast narrowband testbed demonstration

[+] Author Affiliations
Byoung-Joon Seo, Brian Gordon, Brian Kern, Andy Kuhnert, Dwight Moody, Richard Muller, Ilya Poberezhskiy, John Trauger, Daniel Wilson

Jet Propulsion Laboratory, M/S 321-100, 4800 Oak Grove Drive, Pasadena, California 91109, United States

J. Astron. Telesc. Instrum. Syst. 2(1), 011019 (Mar 08, 2016). doi:10.1117/1.JATIS.2.1.011019
History: Received June 14, 2015; Accepted February 11, 2016
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Abstract.  Hybrid Lyot coronagraph (HLC) is one of the two operating modes of the WFIRST-AFTA coronagraph instrument. It produces starlight suppression over the full 360-deg annular region and thus is particularly suitable to improve the discovery space around WFIRST-AFTA targets. Since being selected by the National Aeronautics and Space Administration in December 2013, the coronagraph technology is being matured to technology readiness level 5 by September 2016. We present the progress of HLC key component fabrication and testbed demonstrations with the WFIRST-AFTA pupil. For the first time, a circular HLC occulter mask consisting of metal and dielectric layers is fabricated and characterized. Wavefront control using two deformable mirrors is successfully demonstrated in a vacuum testbed with narrowband light (<1-nm bandwidth at 516 nm) to obtain repeatable convergence below 8×109 mean contrast in the 360-deg dark hole with a working angle between 3λ/D and 9λ/D with arbitrary polarization. We detail the hardware and software used in the testbed, the results, and the associated analysis.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Byoung-Joon Seo ; Brian Gordon ; Brian Kern ; Andy Kuhnert ; Dwight Moody, et al.
"Hybrid Lyot coronagraph for wide-field infrared survey telescope-astrophysics focused telescope assets: occulter fabrication and high contrast narrowband testbed demonstration", J. Astron. Telesc. Instrum. Syst. 2(1), 011019 (Mar 08, 2016). ; http://dx.doi.org/10.1117/1.JATIS.2.1.011019


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