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Proceedings Paper

Estimating phase errors from pupil discontinuities from simulated on sky data: examples with VLT and Keck
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Paper Abstract

We propose and apply two methods for estimating phase discontinuities for two realistic scenarios on VLT and Keck. The methods use both phase diversity and a form of image sharpening. For the case of VLT, we simulate the `low wind effect' (LWE) which is responsible for focal plane errors in low wind and good seeing conditions. We successfully estimate the LWE using both methods, and show that using both methods both independently and together yields promising results. We also show the use of single image phase diversity in the LWE estimation, and show that it too yields promising results. Finally, we simulate segmented piston effects on Keck/NIRC2 images and successfully recover the induced phase errors using single image phase diversity. We also show that on Keck we can estimate both the segmented piston errors and any Zernike modes affiliated with the non-common path.

Paper Details

Date Published: 27 July 2016
PDF: 11 pages
Proc. SPIE 9909, Adaptive Optics Systems V, 99096D (27 July 2016); doi: 10.1117/12.2233093
Show Author Affiliations
Masen Lamb, Univ. of Victoria (Canada)
NRC Herzberg Astronomy (Canada)
Carlos Correia, Aix Marseille Univ., CNRS, LAM (France)
Jean-François Sauvage, Aix Marseille Univ., CNRS, LAM (France)
ONERA (France)
Jean-Pierre Véran, NRC Herzberg Astronomy (Canada)
David Andersen, NRC Herzberg Astronomy (Canada)
Arthur Vigan, Aix Marseille Univ., CNRS, LAM (France)
Peter Wizinowich, W. M. Keck Observatory (United States)
Marcos van Dam, Flat Wavefronts (New Zealand)
Laurent Mugnier, ONERA (France)
Charlotte Bond, Aix Marseille Univ., CNRS, LAM (France)

Published in SPIE Proceedings Vol. 9909:
Adaptive Optics Systems V
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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