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

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

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4839.1001d&link_type=abstract

Adaptive Optical System Technologies II. Edited by Wizinowich, Peter L.; Bonaccini, Domenico. Proceedings of the SPIE, Volume 4

Physics

Optics

Scientific paper

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.

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