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Author

P. Fontanillas

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2 papers indexed here

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Aug 2026

Modal CNN reconstruction for an unmodulated pyramid wavefront sensor in SAXO+

The unmodulated pyramid wavefront sensor offers high sensitivity but requires accurate reconstruction of its nonlinear response. We present a convolutional neural network that directly estimates deformable-mirror modal coefficients from the four pyramid pupil images. Unlike image-to-grid approaches, the modal output ca...

P. Vermot, P. Fontanillas, D. Gratadour · 1 citation
Review Open access Aug 2026

SAXO+, the second-stage adaptive optics for SPHERE: a review of six selected control algorithms and the results achieved to date

SAXO+ is the second-stage adaptive optics (AO) system that will be added in cascade after SPHERE’s current extreme AO system at the VLT. This upgrade of SPHERE aims to improve coronagraphic contrast by a factor of 10 or more, close to the star, and to extend the performance to fainter, redder targets. To achieve these...

M. Tallon, C. B'echet, I. Dinis et al. · 5 citations

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