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13 September 2012 Modeling anisoplanatism in the Keck II laser guide star AO system
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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Proceedings Volume 8447, Adaptive Optics Systems III; 844724 (2012) https://doi.org/10.1117/12.926700
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands
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.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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, and Sylvana Yelda "Modeling anisoplanatism in the Keck II laser guide star AO system", Proc. SPIE 8447, Adaptive Optics Systems III, 844724 (13 September 2012); https://doi.org/10.1117/12.926700
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KEYWORDS
Stars
Point spread functions
Adaptive optics
Laser guide stars
Electroluminescent displays
Atmospheric modeling
Optical transfer functions
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