Some novel concepts in multipyramid wavefront sensing

Emiliano Diolaiti; Andrea Tozzi; Roberto Ragazzoni; Debora Ferruzzi; Elise Vernet-Viard; Simone Esposito; Jacopo Farinato; Adriano Ghedina; Armando Riccardi

doi:10.1117/12.458963

7 February 2003 Some novel concepts in multipyramid wavefront sensing

Emiliano Diolaiti, Andrea Tozzi, Roberto Ragazzoni, Debora Ferruzzi, Elise Vernet-Viard, Simone Esposito, Jacopo Farinato, Adriano Ghedina, Armando Riccardi

Author Affiliations +

Proceedings Volume 4839, Adaptive Optical System Technologies II; (2003) https://doi.org/10.1117/12.458963
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

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.

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Emiliano Diolaiti, Andrea Tozzi, Roberto Ragazzoni, Debora Ferruzzi, Elise Vernet-Viard, Simone Esposito, Jacopo Farinato, Adriano Ghedina, and Armando Riccardi "Some novel concepts in multipyramid wavefront sensing", Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003); https://doi.org/10.1117/12.458963

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