High-contrast imager for complex aperture telescopes (HiCAT): 10. Broadband Zernike wavefront sensor under natural and artificial drifts

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

doi:10.1117/12.2677790

6 October 2023 High-contrast imager for complex aperture telescopes (HiCAT): 10. Broadband Zernike wavefront sensor under natural and artificial drifts

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

Author Affiliations +

Proceedings Volume 12680, Techniques and Instrumentation for Detection of Exoplanets XI; 126801F (2023) https://doi.org/10.1117/12.2677790
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

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.

Conference Presentation

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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, and 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

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KEYWORDS

Wavefront sensors

Imaging systems

Telescopes

Coronagraphy

Deformable mirrors

Image segmentation

Monochromatic aberrations

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