Raphaël Pourcelot,1 Emiel H. Por,1 Mamadou N'Diaye,2 Benjamin Buralli,2 Marcel Carbillet,3 Kjetil Dohlen,4 Sylvain Egron,5 Marc Ferrari,4 Rachel Fox,6 Rob Gontrum,1 Iva Laginja,7 Meiji M. Nguyen,1 Bryony Nickson,1 Marshall D. Perrin,1 Peter Petrone,1 Laurent Pueyo,1 Susan F. Redmondhttps://orcid.org/0000-0002-9618-4371,8 Ananya Sahoo,1 Anand Sivaramakrishnan,1 Hari B. Subedi,9 Sam Weinstock,1 Scott D. Will,9 Rémi Soummer,1 John G. Hagopian10
1Space Telescope Science Institute (United States) 2Observatoire de la Côte d'Azur (France) 3Observatoire de la Côte d’Azur (France) 4Lab. d'Astrophysique de Marseille (France) 5Iridescence (France) 6Johns Hopkins Univ. (United States) 7Lab. d'Etudes Spatiales et d'Instrumentation en Astrophysique (France) 8Princeton Univ. (United States) 9NASA Goddard Space Flight Ctr. (United States) 10Advanced NanoPhotonics, Inc. (United States)
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We report on experimental stabilization of low-order aberrations on a high-contrast testbed for exoplanet imaging, in up to 10% broadband light under natural and artificial drifts. The measurements are performed with a Zernike wavefront sensor using the light rejected by the focal plane mask of an apodized Lyot coronagraph. We conduct the experiments on the High-contrast imager for Complex Aperture Telescopes testbed, with a segmented aperture and two continuous deformable mirrors. We study several use cases, from the stabilization of a pre-established dark hole to the concurrent combination with focal-plane wavefront sensing in the form of sequential pairwise sensing over several wavelengths.
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Raphaël Pourcelot, Emiel H. Por, Mamadou N'Diaye, Benjamin Buralli, Marcel Carbillet, Kjetil Dohlen, Sylvain Egron, Marc Ferrari, Rachel Fox, Rob Gontrum, Iva Laginja, Meiji M. Nguyen, Bryony Nickson, Marshall D. Perrin, Peter Petrone, Laurent Pueyo, Susan F. Redmond, Ananya Sahoo, Anand Sivaramakrishnan, Hari B. Subedi, Sam Weinstock, Scott D. Will, Rémi Soummer, John G. Hagopian, "High-contrast imager for complex aperture telescopes (HiCAT): 10. Broadband Zernike wavefront sensor under natural and artificial drifts," Proc. SPIE 12680, Techniques and Instrumentation for Detection of Exoplanets XI, 126801F (6 October 2023); https://doi.org/10.1117/12.2677790