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Proceedings Paper

Modeling anisoplanatism in the Keck II laser guide star AO system
Author(s): Michael P. Fitzgerald; Gunther Witzel; Matthew C. Britton; Andrea M. Ghez; Leo Meyer; Breann N. Sitarski; Carina Cheng; Eric E. Becklin; Randall D. Campbell; Tuan Do; Jessica R. Lu; Keith Matthews; Mark R. Morris; Christopher R. Neyman; Glenn A. Tyler; Peter L. Wizinowich; Sylvana Yelda
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Paper Abstract

Anisoplanatism is a primary source of photometric and astrometric error in single-conjugate adaptive optics. We present initial results of a project to model the off-axis optical transfer function in the adaptive optics system at the Keck II telescope. The model currently accounts for the effects of atmospheric anisoplanatism in natural guide star observations. The model for the atmospheric contribution to the anisoplanatic transfer function uses contemporaneous MASS/ DIMM measurements. Here we present the results of a validation campaign using observations of naturally guided visual binary stars under varying conditions, parameterized by the r0 and θ0 parameters of the C2n atmospheric turbulence profile. We are working to construct a model of the instrumental field-dependent aberrations in the NIRC2 camera using an artificial source in the Nasmyth focal plane. We also discuss our plans to extend the work to laser guide star operation.

Paper Details

Date Published: 13 September 2012
PDF: 11 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 844724 (13 September 2012); doi: 10.1117/12.926700
Show Author Affiliations
Michael P. Fitzgerald, Univ. of California, Los Angeles (United States)
Gunther Witzel, Univ. of California, Los Angeles (United States)
Matthew C. Britton, the Optical Sciences Co. (United States)
Andrea M. Ghez, Univ. of California, Los Angeles (United States)
Leo Meyer, Univ. of California, Los Angeles (United States)
Breann N. Sitarski, Univ. of California, Los Angeles (United States)
Carina Cheng, Univ. of California, Los Angeles (United States)
Eric E. Becklin, Univ. of California, Los Angeles (United States)
Randall D. Campbell, W. M. Keck Observatory (United States)
Tuan Do, Univ. of California, Irvine (United States)
Jessica R. Lu, Institute for Astronomy (United States)
Keith Matthews, California Institute of Technology (United States)
Mark R. Morris, Univ. of California, Los Angeles (United States)
Christopher R. Neyman, W. M. Keck Observatory (United States)
Glenn A. Tyler, the Optical Sciences Co. (United States)
Peter L. Wizinowich, W. M. Keck Observatory (United States)
Sylvana Yelda, Univ. of California, Los Angeles (United States)


Published in SPIE Proceedings Vol. 8447:
Adaptive Optics Systems III
Brent L. Ellerbroek; Enrico Marchetti; Jean-Pierre Véran, Editor(s)

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