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Proceedings Paper

Identification and rejection of waffle modes in layer-oriented adaptive optics
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Paper Abstract

Waffle modes are known in adaptive optics as wavefront perturbations giving a null or very small measurement on the wavefront sensor; when these modes appear on the deformable mirror, they are allowed to grow arbitrarly, generating loop instability and degrading the correction. In Multi-Conjugate Adaptive Optics, apart from the invisible modes related to the properties of the wavefront sensors, additional waffle modes may arise depending on the spatial configuration of the guide stars. The relevance of the problem to the layer-oriented approach is discussed, along with a practical method to identify them for a given guide stars asterism. Furthermore some strategies are described to face the problem at the real-time software level, with no additional complication on the hardware side.

Paper Details

Date Published: 7 February 2003
PDF: 10 pages
Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003); doi: 10.1117/12.458960
Show Author Affiliations
Emiliano Diolaiti, Univ. degli Studi di Padova (Italy)
Carmelo Arcidiacono, Univ. degli Studi di Firenze (Italy)
Roberto Ragazzoni, Osservatorio Astrofisico di Arcetri/INAF and Max-Planck-Institut fur Astronomie (Italy)
Enrico Fedrigo, European Southern Observatory (Germany)


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

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