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13 August 2014 Modeling instrumental field-dependent aberrations in the NIRC2 instrument on the Keck II telescope
Breann N. Sitarski, Gunther Witzel, Michael P. Fitzgerald, Leo Meyer, Andrea M. Ghez, Randall D. Campbell, Jessica R. Lu, Keith Matthews, Peter Wizinowich, Jim Lyke
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Proceedings Volume 9148, Adaptive Optics Systems IV; 91486T (2014) https://doi.org/10.1117/12.2057140
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada
Abstract
We present a model of field-dependent aberrations arising in the NIRC2 instrument on the W. M. Keck II telescope. We use high signal-to-noise phase diversity data employing a source in the Nasmyth focal plane to construct a model of the optical path difference as a function of field position and wavelength. With a differential wavefront error of up to 190 nm, this effect is one of the main sources of astrometric and photometric measurement uncertainties. Our tests of temporal stability show sufficient reliability for our measurements over a 20-month period at the field extrema. Additionally, while chromaticity exists, applying a correction for field-dependent aberrations provides overall improvement compared to the existing aberrations present across the field of view.
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Breann N. Sitarski, Gunther Witzel, Michael P. Fitzgerald, Leo Meyer, Andrea M. Ghez, Randall D. Campbell, Jessica R. Lu, Keith Matthews, Peter Wizinowich, and Jim Lyke "Modeling instrumental field-dependent aberrations in the NIRC2 instrument on the Keck II telescope", Proc. SPIE 9148, Adaptive Optics Systems IV, 91486T (13 August 2014); https://doi.org/10.1117/12.2057140
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KEYWORDS
Iron
Wavefronts
Data centers
Adaptive optics
Point spread functions
Instrument modeling
Sensors
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