Using a pyramid wavefront sensor off-zero: from theory to practice

A. Striffling; C.-T. Héritier; R. J.-L. Fétick; J.-F. Sauvage; A. Carlotti; O. Fauvarque; B. Neichel; T. Fusco

doi:10.1117/12.3019000

27 August 2024 Using a pyramid wavefront sensor off-zero: from theory to practice

A. Striffling, C.-T. Héritier, R. J.-L. Fétick, J.-F. Sauvage, A. Carlotti, O. Fauvarque, B. Neichel, T. Fusco

Proceedings Volume 13097, Adaptive Optics Systems IX; 130971M (2024) https://doi.org/10.1117/12.3019000
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

The pyramid wavefront sensor has become an essential asset for extreme adaptive optics systems, as it offers a high sensitivity. Its main drawback remains its nonlinear behaviour. Using a gain sensing camera and a convolutional model enables the tracking of the first order nonlinearities, called the optical gains. They can be used in the reconstructor as an optimal modal gain integrator as they express the loss of sensitivity of the system in presence of residuals. Knowing them also makes it possible to offset the pyramid and maintain this offset during a closed loop. This operation allows to compensate for non-common path aberration, to maintain an absolute tip-tilt for fiber injection and to introduce dark-hole maps for high contrast imaging. This study explore the behaviour of the offsetted pyramid wavefront sensor assisted by a gain sensing camera, in simulation and experimentally with the AO-bench PAPYRUS.

Conference Presentation

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

Citation Download Citation

A. Striffling, C.-T. Héritier, R. J.-L. Fétick, J.-F. Sauvage, A. Carlotti, O. Fauvarque, B. Neichel, and T. Fusco "Using a pyramid wavefront sensor off-zero: from theory to practice", Proc. SPIE 13097, Adaptive Optics Systems IX, 130971M (27 August 2024); https://doi.org/10.1117/12.3019000

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