High-contrast imager for complex aperture telescopes (HiCAT): 7. Dark zone demonstration with fully segmented aperture coronagraph

Rémi Soummer; Iva Laginja; Scott Will; Marshall D. Perrin; James Noss; Emiel H. Por; Susan Redmond; Raphaël Pourcelot; Ananya Sahoo; Peter Petrone; Keira Brooks; Laurent Pueyo; Bryony Nickson; Matt Maclay; Gregory R. Brady; Thomas Comeau; Julia Fowler; Kelsey Glazer; Rob Gontrum; John Hagopian; Theo Jolivet; Maggie Kautz; Lucie Leboulleux; Evelyn McChesney; Laurent Mugnier; Mamadou N'Diaye; Meiji Nguyen; Heather Olszewski; Leonid Pogorelyuk; Jaret Prothro; Jean-François Sauvage; Nathan Scott; Ron Shiri; Anand Sivaramakrishnan; Hari Subedi; Sam Weinstock; Yinzi Xin; Rebecca Zhang

doi:10.1117/12.2594684

4 August 2021 High-contrast imager for complex aperture telescopes (HiCAT): 7. Dark zone demonstration with fully segmented aperture coronagraph

Rémi Soummer, Iva Laginja, Scott Will, Marshall D. Perrin, James Noss, Emiel H. Por, Susan Redmond, Raphaël Pourcelot, Ananya Sahoo, Peter Petrone, Keira Brooks, Laurent Pueyo, Bryony Nickson, Matt Maclay, Gregory R. Brady, Thomas Comeau, Julia Fowler, Kelsey Glazer, Rob Gontrum, John Hagopian, Theo Jolivet, Maggie Kautz, Lucie Leboulleux, Evelyn McChesney, Laurent Mugnier, Mamadou N'Diaye, Meiji Nguyen, Heather Olszewski, Leonid Pogorelyuk, Jaret Prothro, Jean-François Sauvage, Nathan Scott, Ron Shiri, Anand Sivaramakrishnan, Hari Subedi, Sam Weinstock, Yinzi Xin, Rebecca Zhang

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Proceedings Volume 11823, Techniques and Instrumentation for Detection of Exoplanets X; 118230T (2021) https://doi.org/10.1117/12.2594684
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

We present recent laboratory results demonstrating high-contrast coronagraphy for future space-based large segmented telescopes such as the Large UV, Optical, IR telescope (LUVOIR) mission concept studied by NASA. The High-contrast Imager for Complex Aperture Telescopes (HiCAT) testbed aims to implement a system-level hardware demonstration for segmented aperture coronagraphs with wavefront control. The telescope hardware simulator employs a segmented deformable mirror with 36 hexagonal segments that can be controlled in piston, tip, and tilt. In addition, two continuous deformable mirrors are used for high-order wavefront sensing and control. The low-order sensing subsystem includes a dedicated tip-tilt stage, a coronagraphic target acquisition camera, and a Zernike wavefront sensor that is used to measure low-order aberration drifts. We explore the performance of a segmented aperture coronagraph both in “static” operations (limited by natural drifts and instabilities) and in “dynamic” operations (in the presence of artificial wavefront drifts added to the deformable mirrors), and discuss the estimation and control strategies used to reach and maintain the dark zone contrast. We summarize experimental results that quantify the performance of the testbed in terms of contrast, inner/outer working angle and bandpass, and analyze limiting factors by comparing against our end-to-end models.

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Rémi Soummer, Iva Laginja, Scott Will, Marshall D. Perrin, James Noss, Emiel H. Por, Susan Redmond, Raphaël Pourcelot, Ananya Sahoo, Peter Petrone, Keira Brooks, Laurent Pueyo, Bryony Nickson, Matt Maclay, Gregory R. Brady, Thomas Comeau, Julia Fowler, Kelsey Glazer, Rob Gontrum, John Hagopian, Theo Jolivet, Maggie Kautz, Lucie Leboulleux, Evelyn McChesney, Laurent Mugnier, Mamadou N'Diaye, Meiji Nguyen, Heather Olszewski, Leonid Pogorelyuk, Jaret Prothro, Jean-François Sauvage, Nathan Scott, Ron Shiri, Anand Sivaramakrishnan, Hari Subedi, Sam Weinstock, Yinzi Xin, and Rebecca Zhang "High-contrast imager for complex aperture telescopes (HiCAT): 7. Dark zone demonstration with fully segmented aperture coronagraph", Proc. SPIE 11823, Techniques and Instrumentation for Detection of Exoplanets X, 118230T (4 August 2021); https://doi.org/10.1117/12.2594684

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KEYWORDS

Coronagraphy

Image segmentation

Telescopes

Imaging systems

Wavefront sensors

Deformable mirrors

Wavefronts

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