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Layer Oriented Wavefront sensor for MAD on Sky operations

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arxiv 0911.4879 v1 pith:ZTC4M42X submitted 2009-11-25 astro-ph.IM

Carmelo Arcidiacono , Matteo Lombini , Roberto Ragazzoni , Jacopo Farinato , Emiliano Diolaiti , Andrea Baruffolo , Paolo Bagnara , Giorgia Gentile
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Laura Schreiber Enrico Marchetti Johann Kolb Sebastien Tordo Robert Donaldson Christian Soenke Sylvain Oberti Enrico Fedrigo Elise Vernet Norbert Hubin
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keywords layerorientedadaptivemulticonjugateoperationsopticssensorwavefront
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The Multiconjugate Adaptive optics Demonstrator (MAD) has successfully demonstrated on sky both Star Oriented (SO) and Layer Oriented (LO) multiconjugate adaptive optics techniques. While SO has been realized using 3 Shack-Hartmann wavefront sensors (WFS), we designed a multi-pyramid WFS for the LO. The MAD bench accommodates both WFSs and a selecting mirror allows choosing which sensor to use. In the LO approach up to 8 pyramids can be placed on as many reference stars and their light is co-added optically on two different CCDs conjugated at ground and to an high layer. In this paper we discuss LO commissioning phase and on sky operations.

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