Using a pyramid wavefront sensor off-zero: from theory to practice - ONERA - Office national d'études et de recherches aérospatiales
Communication Dans Un Congrès Année : 2024

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

Résumé

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.
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Dates et versions

hal-04714570 , version 1 (30-09-2024)

Identifiants

Citer

Arnaud Striffling, Cédric Taïssir Héritier, Romain Fétick, Jean-François Sauvage, Alexis Carlotti, et al.. Using a pyramid wavefront sensor off-zero: from theory to practice. SPIE Astronomical Telescopes + Instrumentation 2024, Jun 2024, Yokohama, Japan. pp.130971M, ⟨10.1117/12.3019000⟩. ⟨hal-04714570⟩
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