Spectral interferometric wavefront sensing: a solution for petalometry at Subaru/SCExAO

V. Deo; S. Vievard; M. Lallement; M. Lucas; E. Huby; K. Ahn; O. Guyon; J. Lozi; H.-D. Kenchington Goldsmith; S. Lacour; G. Martin; B. Norris; G. Perrin; G. Singh; P. Tuthill

doi:10.1117/12.3019419

13 September 2024 Spectral interferometric wavefront sensing: a solution for petalometry at Subaru/SCExAO

V. Deo, S. Vievard, M. Lallement, M. Lucas, E. Huby, K. Ahn, O. Guyon, J. Lozi, H.-D. Kenchington Goldsmith, S. Lacour, G. Martin, B. Norris, G. Perrin, G. Singh, P. Tuthill

Author Affiliations +

Proceedings Volume 13097, Adaptive Optics Systems IX; 130972G (2024) https://doi.org/10.1117/12.3019419
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

The petaling effect, induced by pupil fragmentation from the telescope spider, drastically affects the performance of high contrast instruments by inducing core splitting on the PSF. Differential piston/tip/tilt aberrations within each optically separated fragment of the pupil are poorly measured by commonly used Adaptive Optics (AO) systems. We here pursue a design of dedicated low-order wavefront sensor – or petalometers – to complement the main AO. Interferometric devices sense differential aberrations between fragments with optimal sensitivity; their weakness though is their limitation to wrapped phase measurements. We show that by combining multiple spectral channels, we increase the capture range for petaling aberrations beyond several microns, enough to disambiguate one-wave wrapping errors made by the main AO system. We propose here to implement a petalometer from the multi-wavelength imaging mode of the VAMPIRES visible-light instrument, deployed on SCExAO at the Subaru Telescope. The interferometric measurements obtained in four spectral channels through a 7 hole non-redundant mask allow us to efficiently reconstruct differential piston between pupil petals.

Conference Presentation

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

Citation Download Citation

V. Deo, S. Vievard, M. Lallement, M. Lucas, E. Huby, K. Ahn, O. Guyon, J. Lozi, H.-D. Kenchington Goldsmith, S. Lacour, G. Martin, B. Norris, G. Perrin, G. Singh, and P. Tuthill "Spectral interferometric wavefront sensing: a solution for petalometry at Subaru/SCExAO", Proc. SPIE 13097, Adaptive Optics Systems IX, 130972G (13 September 2024); https://doi.org/10.1117/12.3019419

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