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Proceedings Paper

High-contrast imager for complex aperture telescopes (HiCAT): 1. testbed design
Author(s): Mamadou N'Diaye; Elodie Choquet; Laurent Pueyo; Erin Elliot; Marshall D. Perrin; J. Kent Wallace; Tyler Groff; Alexis Carlotti; Dimitri Mawet; Matt Sheckells; Stuart Shaklan; Bruce Macintosh; N. Jeremy Kasdin; Rémi Soummer
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Paper Abstract

Searching for nearby habitable worlds with direct imaging and spectroscopy will require a telescope large enough to provide angular resolution and sensitivity to planets around a significant sample of stars. Segmented telescopes are a compelling option to obtain such large apertures. However, these telescope designs have a complex geometry (central obstruction, support structures, segmentation) that makes high-contrast imaging more challenging. We are developing a new high-contrast imaging testbed at STScI to provide an integrated solution for wavefront control and starlight suppression on complex aperture geometries. We present our approach for the testbed optical design, which defines the surface requirements for each mirror to minimize the amplitude-induced errors from the propagation of out-of-pupil surfaces. Our approach guarantees that the testbed will not be limited by these Fresnel propagation effects, but only by the aperture geometry. This approach involves iterations between classical ray-tracing optical design optimization, and end-to-end Fresnel propagation with wavefront control (e.g. Electric Field Conjugation / Stroke Minimization). The construction of the testbed is planned to start in late Fall 2013.

Paper Details

Date Published: 26 September 2013
PDF: 10 pages
Proc. SPIE 8864, Techniques and Instrumentation for Detection of Exoplanets VI, 88641K (26 September 2013); doi: 10.1117/12.2023718
Show Author Affiliations
Mamadou N'Diaye, Space Telescope Science Institute (United States)
Elodie Choquet, Space Telescope Science Institute (United States)
Laurent Pueyo, Space Telescope Science Institute (United States)
Johns Hopkins Univ. (United States)
Erin Elliot, Space Telescope Science Institute (United States)
Marshall D. Perrin, Space Telescope Science Institute (United States)
J. Kent Wallace, Jet Propulsion Lab. (United States)
Tyler Groff, Princeton Univ. (United States)
Alexis Carlotti, IPAG, CNRS, Univ. Joseph Fourier (France)
Dimitri Mawet, European Southern Observatory (Chile)
Jet Propulsion Lab. (United States)
Matt Sheckells, Johns Hopkins Univ. (United States)
Stuart Shaklan, Jet Propulsion Lab. (United States)
Bruce Macintosh, Lawrence Livermore National Lab. (Canada)
N. Jeremy Kasdin, Princeton Univ. (United States)
Rémi Soummer, Space Telescope Science Institute (United States)

Published in SPIE Proceedings Vol. 8864:
Techniques and Instrumentation for Detection of Exoplanets VI
Stuart Shaklan, Editor(s)

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