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Proceedings Paper

Exploring the operational effects of phase diversity for the calibration of non-common path errors on NFIRAOS
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Paper Abstract

We propose two methods to characterize the Non-Common Path Aberrations (NCPA) on the TMT/NFIRAOS system; these techniques are known as Phase Diversity and Focal Plane Sharpening. We demonstrate the feasibility of these techniques on an experimental bench. We also explore the operational effects of Phase Diversity and how it might be best applied to a NFIRAOS-like system. In particular we explore the technique of single image Phase Diversity along with the effects of i) estimating either Zernike modes or Disk Harmonics, ii) using multiple diverse images, and iii) using diversities other than focus. These operational considerations are explored in a simulation of the NFIRAOS system and we aim to find the best estimation of the NFIRAOS NCPA in the presence of different levels of noise. We find a realistic estimation of NFIRAOS NCPA would be with multi-image Phase Diversity - with focus-diverse images sampled at asymmetric positions on either side of the focal plane (with no estimation of the object).

Paper Details

Date Published: 27 July 2016
PDF: 13 pages
Proc. SPIE 9909, Adaptive Optics Systems V, 99096E (27 July 2016); doi: 10.1117/12.2233043
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)
David Andersen, NRC Herzberg Astronomy (Canada)
Jean-Pierre Véran, NRC Herzberg Astronomy (Canada)

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

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