Vortex coronagraph: revisiting the phase retrieval properties via Zernike analysis

G. Orban de Xivry; O. Absil

doi:10.1117/12.3019164

27 August 2024 Vortex coronagraph: revisiting the phase retrieval properties via Zernike analysis

G. Orban de Xivry, O. Absil

Author Affiliations +

Proceedings Volume 13097, Adaptive Optics Systems IX; 1309740 (2024) https://doi.org/10.1117/12.3019164
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

High contrast imaging (HCI) is fundamentally limited by wavefront aberrations, and the ability to perform wavefront sensing from focal plane images is key to reach the full potential of ground and space-based instruments. Vortex focal plane mask coupled with downstream pupil (Lyot) stop stands as one of the best small-angle coronagraphs, but is also sensitive to low-order aberrations. Here, we revisit the behavior of the vortex phase mask, from entrance pupil down to the final detector plane, with Zernike polynomials as input phase aberrations. In particular we develop a second-order expansion that allows us to analyze the phase retrieval properties in a more intuitive and accurate way than previously proposed. With this formalism, we show how the azimuthal vortex modulation modifies the phase retrieval properties compared to normal imaging. In particular, our results suggest that images obtained with a scalar vortex coronagraph can be used for unambiguous focal-plane wavefront sensing in any practical situation. We compare our results with numerical simulations and discuss practical implementation in coronagraphic instruments.

Citation Download Citation

G. Orban de Xivry and O. Absil "Vortex coronagraph: revisiting the phase retrieval properties via Zernike analysis", Proc. SPIE 13097, Adaptive Optics Systems IX, 1309740 (27 August 2024); https://doi.org/10.1117/12.3019164

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