8 March 2016 Hybrid Lyot coronagraph for wide-field infrared survey telescope-astrophysics focused telescope assets: occulter fabrication and high contrast narrowband testbed demonstration
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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 8×10−9 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.
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
Byoung-Joon Seo, Byoung-Joon Seo, Brian L. Gordon, Brian L. Gordon, Brian Kern, Brian Kern, Andreas C. Kuhnert, Andreas C. Kuhnert, Dwight C. Moody, Dwight C. Moody, Richard E. Muller, Richard E. Muller, Ilya Poberezhskiy, Ilya Poberezhskiy, John T. Trauger, John T. Trauger, Daniel W. Wilson, Daniel W. Wilson, } "Hybrid Lyot coronagraph for wide-field infrared survey telescope-astrophysics focused telescope assets: occulter fabrication and high contrast narrowband testbed demonstration," Journal of Astronomical Telescopes, Instruments, and Systems 2(1), 011019 (8 March 2016). https://doi.org/10.1117/1.JATIS.2.1.011019 . Submission:
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