High contrast imaging wavefront sensor referencing from coronagraphic images

Nour Skaf; Olivier Guyon; Anthony Boccaletti; Vincent Deo; Julien Lozi; Sebastien Vievard; Thayne Currie; Barnaby Norris; Kyohoon Ahn; Eric Gendron; Fabrice Vidal; Florian Ferreira; Arnaud Sevin; Arielle Bertrou-Cantou

doi:10.1117/12.2595008

29 October 2021 High contrast imaging wavefront sensor referencing from coronagraphic images

Nour Skaf, Olivier Guyon, Anthony Boccaletti, Vincent Deo, Julien Lozi, Sebastien Vievard, Thayne Currie, Barnaby Norris, Kyohoon Ahn, Eric Gendron, Fabrice Vidal, Florian Ferreira, Arnaud Sevin, Arielle Bertrou-Cantou

Author Affiliations +

Proceedings Volume 11823, Techniques and Instrumentation for Detection of Exoplanets X; 1182319 (2021) https://doi.org/10.1117/12.2595008
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

A key challenge of high contrast imaging (HCI) is to differentiate a speckle from an exoplanet signal. The sources of speckles are a combination of atmospheric residuals and aberrations in the non-common path. Those non-common path aberrations (NCPA) are particularly challenging to compensate for as they are not directly measured, and because they include static, quasi-static and dynamic components. The proposed method directly addresses the challenge of compensating the NCPA. The algorithm DrWHO - Direct Reinforcement Wavefront Heuristic Optimisation - is a quasi-real-time compensation of static and dynamic NCPA for boosting image contrast. It is an image-based lucky imaging approach, aimed at finding and continuously updating the ideal reference of the wavefront sensor (WFS) that includes the NCPA, and updating this new reference to the WFS. Doing so changes the point of convergence of the AO loop. We show here the first results of a post-coronagraphic application of DrWHO. DrWHO does not rely on any model nor requires accurate wavefront sensor calibration, and is applicable to non-linear wavefront sensing situations. We present on-sky performances using a pyramid WFS sensor with the Subaru coronagraph extreme AO (SCExAO) instrument.

Conference Presentation

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Nour Skaf, Olivier Guyon, Anthony Boccaletti, Vincent Deo, Julien Lozi, Sebastien Vievard, Thayne Currie, Barnaby Norris, Kyohoon Ahn, Eric Gendron, Fabrice Vidal, Florian Ferreira, Arnaud Sevin, and Arielle Bertrou-Cantou "High contrast imaging wavefront sensor referencing from coronagraphic images", Proc. SPIE 11823, Techniques and Instrumentation for Detection of Exoplanets X, 1182319 (29 October 2021); https://doi.org/10.1117/12.2595008

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