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The CAFADIS camera: a new tomographic wavefront sensor for Adaptive Optics.

Abstract 152

Submitted by José Manuel RODRIGUEZ-RAMOS


J.M. Rodríguez-Ramos (1), B. Femenía Castellá (2), J.G. Marichal-Hernández (1), F.P. Nava (1), Y. Martín Hernando (2), L.F. Rodríguez-Ramos (2)


(1) University of La Laguna; (2) Instituto de Astrofísica de Canarias


The CAFADIS camera is a new wavefront sensor (WFS) patented by the Universidad de La Laguna (Tenerife, Spain) . CAFADIS is a system based on the concept of plenoptic camera originally proposed by Adelson and Wang (1991) and its most salient feature is its ability to simultaneously measuring wavefront maps and distances to objects. This makes of CAFADIS an interesting alternative for LGS-based AO systems as it is capable of measuring from an LGS-beacon the atmospheric turbulence wavefront and simultaneously the distance to the LGS beacon thus removing the of a NGS defocus sensor to probe changes in distance to the LGS beacon due to drifts of the mesospheric Na layer. In principle, the concept can also be employed to recover 3D profiles of the Na Layer allowing for optimizations of the measurement of the distance to the LGS-beacon. Currently we are investigating the possibility of extending the plenoptic WFS into a tomographic wavefront sensor. This study is being carried out within the WFS alternatives search for the AO system within the European Solar Telescope (EST) proposal. Simulations will be shown of a plenoptic WFS when operated within an LGS-based AO system and with extended objects (as in the case of a solar telescope) for the recovery of wavefront maps at different heights.

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