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7 February 2003 Identification and rejection of waffle modes in layer-oriented adaptive optics
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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.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Emiliano Diolaiti, Carmelo Arcidiacono, Roberto Ragazzoni, and Enrico Fedrigo "Identification and rejection of waffle modes in layer-oriented adaptive optics", Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003);

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