Revisiting the Borde-Traub focal plane wavefront estimation technique for exoplanet direct imaging

Axel Potier; A. J. Eldorado Riggs; Garreth Ruane; Phillip K. Poon; Matthew R. Noyes; Greg W. Allan; Alexander Walter; Camilo Mejia Prada; Raphaël Galicher; Johan Mazoyer; Pierre Baudoz

doi:10.1117/12.3018289

23 August 2024 Revisiting the Borde-Traub focal plane wavefront estimation technique for exoplanet direct imaging

Axel Potier, A. J. Eldorado Riggs, Garreth Ruane, Phillip K. Poon, Matthew R. Noyes, Greg W. Allan, Alexander Walter, Camilo Mejia Prada, Raphaël Galicher, Johan Mazoyer, Pierre Baudoz

Author Affiliations +

Proceedings Volume 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave; 130926E (2024) https://doi.org/10.1117/12.3018289
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

Direct imaging of exoplanets relies on complex wavefront sensing and control architectures. In addition to fast adaptive optics systems, most of the future high-contrast imaging instruments will soon be equipped with focal plane wavefront sensing algorithms. These techniques use the science detector to estimate the static and quasi-static aberrations induced by optical manufacturing defects and system thermal variations. Pair-wise probing (PWP) has been the most widely used, especially for space-based application and will be tested at contrast levels of ∼1e-9 on-sky along with the future coronagraph instrument onboarding the Roman Space Telescope. This algorithm leans on phase diversities applied on the deformable mirror that are recorded in pairs. A minimum of two pairs of probes are required per bandwidth. An additional unprobed image is also recorded to verify the convergence rate of the correction. Before PWP, Borde & Traub proposed a similar algorithm that takes advantage of the unprobed image in the estimation process to get rid of the pair diversity requirement. In this work, we theoretically show that this latter technique should be more efficient than PWP when the convergence time is not limited by photon noise. We then present its performance and practical limitations on coronagraphic testbeds at JPL and exhibit a first on-sky control of non-common path aberrations with such method on VLT/SPHERE.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Axel Potier, A. J. Eldorado Riggs, Garreth Ruane, Phillip K. Poon, Matthew R. Noyes, Greg W. Allan, Alexander Walter, Camilo Mejia Prada, Raphaël Galicher, Johan Mazoyer, and Pierre Baudoz "Revisiting the Borde-Traub focal plane wavefront estimation technique for exoplanet direct imaging", Proc. SPIE 13092, Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave, 130926E (23 August 2024); https://doi.org/10.1117/12.3018289

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