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Proceedings Paper

Some novel concepts in multipyramid wavefront sensing
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Paper Abstract

We describe some novel technical approaches to implement multi-pyramid wavefront sensing, partially extendable to single pyramid and to any MCAO system. First we introduce an achromatic version of the pyramid, which allows for a much better spatial resolution on the pupil and also relaxes the specifications in term of turned edges. Another item that we discuss is the distribution of tolerances in a layer-oriented AO system which makes attractive, at least in some cases, the usage of pairs of lenslet arrays, leaving only the pyramids free to move over the Field of View, hence relaxing the requirements in terms of roll and yaw in their positioning. Then we discuss the effect of pupil distortion occurring in the layers above the ground during the open loop phases of a MCAO system. Finally we discuss a possible usage of the Modulation Transfer Function as a valuable tool to estimate the correction of a certain Zernike polynomial, achievable with a pyramid wavefront sensor. These items are sketched along with a status of their practical implementation and possible future extensions.

Paper Details

Date Published: 7 February 2003
PDF: 8 pages
Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003); doi: 10.1117/12.458963
Show Author Affiliations
Emiliano Diolaiti, Univ. degli Studi di Padova (Italy)
Andrea Tozzi, Osservatorio Astrofisico di Arcetri (Italy)
Roberto Ragazzoni, Osservatorio Astrofisico di Arcetri and Max-Planck-Institut fur Astronomie (Italy)
Debora Ferruzzi, Osservatorio Astrofisico di Arcetri (Italy)
Elise Vernet-Viard, Osservatorio Astrofisico di Arcetri (Italy)
Simone Esposito, Osservatorio Astrofisico di Arcetri (Italy)
Jacopo Farinato, Osservatorio Astrofisico di Arcetri (Italy)
Adriano Ghedina, Telescopio Nazionale Galileo (Spain)
Armando Riccardi, Osservatorio Astrofisico di Arcetri (Italy)

Published in SPIE Proceedings Vol. 4839:
Adaptive Optical System Technologies II
Peter L. Wizinowich; Domenico Bonaccini, Editor(s)

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