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High-contrast imager for complex aperture telescopes (HiCAT): 5. first results with segmented-aperture coronagraph and wavefront control
Author(s): Rémi Soummer; Gregory R. Brady; Keira Brooks; Thomas Comeau; Élodie Choquet; Tom Dillon; Sylvain Egron; Rob Gontrum; John Hagopian; Iva Laginja; Lucie Leboulleux; Marshall D. Perrin; Peter Petrone; Laurent Pueyo; Johan Mazoyer; Mamadou N'Diaye; A. J. Eldorado Riggs; Ron Shiri; Anand Sivaramakrishnan; Kathryn St. Laurent; Ana-Maria Valenzuela; Neil T. Zimmerman
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Paper Abstract

Segmented telescopes are a possible approach to enable large-aperture space telescopes for the direct imaging and spectroscopy of habitable worlds. However, the increased complexity of their aperture geometry, due to the central obstruction, support structures and segment gaps, makes high-contrast imaging very challenging. The High-contrast imager for Complex Aperture Telescopes (HiCAT) testbed was designed to study and develop solutions for such telescope pupils using wavefront control and coronagraphic starlight suppression. The testbed design has the flexibility to enable studies with increasing complexity for telescope aperture geometries starting with off-axis telescopes, then on-axis telescopes with central obstruction and support structures - e.g. the Wide Field Infrared Survey Telescope (WFIRST) - up to on-axis segmented telescopes, including various concepts for a Large UV, Optical, IR telescope (LUVOIR). In the past year, HiCAT has made significant hardware and software updates in order to accelerate the development of the project. In addition to completely overhauling the software that runs the testbed, we have completed several hardware upgrades, including the second and third deformable mirror, and the first custom Apodized Pupil Lyot Coronagraph (APLC) optimized for the HiCAT aperture, which is similar to one of the possible geometries considered for LUVOIR. The testbed also includes several external metrology features for rapid replacement of parts, and in particular the ability to test multiple apodizers readily, an active tip-tilt control system to compensate for local vibration and air turbulence in the enclosure. On the software and operations side, the software infrastructure enables 24/7 automated experiments that include routine calibration tasks and high-contrast experiments. In this communication we present an overview and status update of the project, both on the hardware and software side, and describe the results obtained with APLC wavefront control.

Paper Details

Date Published: 21 August 2018
PDF: 15 pages
Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 106981O (21 August 2018); doi: 10.1117/12.2314110
Show Author Affiliations
Rémi Soummer, Space Telescope Science Institute (United States)
Gregory R. Brady, Space Telescope Science Institute (United States)
Keira Brooks, Space Telescope Science Institute (United States)
Thomas Comeau, Space Telescope Science Institute (United States)
Élodie Choquet, California Institute of Technology (United States)
Tom Dillon, Univ. of Delaware (United States)
Sylvain Egron, Iridescence S.A.R.L. (France)
Rob Gontrum, Space Telescope Science Institute (United States)
John Hagopian, Advanced NanoPhotonics, Inc. (United States)
Iva Laginja, Space Telescope Science Institute (United States)
Lucie Leboulleux, Space Telescope Science Institute (United States)
Lab. d'Astrophysique de Marseille (France)
Office National d'Etudes et de Recherches Aérospatiales (France)
Marshall D. Perrin, Space Telescope Science Institute (United States)
Peter Petrone, Space Telescope Science Institute (United States)
Sigma Space Corp. (United States)
Laurent Pueyo, Space Telescope Science Institute (United States)
Johan Mazoyer, Johns Hopkins Univ. (United States)
Mamadou N'Diaye, Lab. Lagrange, Observatoire de Nice Côte d'Azur (France)
A. J. Eldorado Riggs, Jet Propulsion Lab. (United States)
Ron Shiri, NASA Goddard Space Flight Ctr. (United States)
Anand Sivaramakrishnan, Space Telescope Science Institute (United States)
Kathryn St. Laurent, Space Telescope Science Institute (United States)
Ana-Maria Valenzuela, Space Telescope Science Institute (United States)
Neil T. Zimmerman, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 10698:
Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave
Makenzie Lystrup; Howard A. MacEwen; Giovanni G. Fazio; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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