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Proceedings Paper

Modeling the transmission and thermal emission in a pupil image behind the Keck II adaptive optics system
Author(s): Pauline Arriaga; Michael P. Fitzgerald; James E. Lyke; Randall D. Campbell; Peter L. Wizinowich; Sean M. Adkins; Keith Y. Matthews
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Paper Abstract

The design and performance of astronomical instruments depend critically on the total system throughput as well as the background emission from the sky and instrumental sources. In designing a pupil stop for background- limited imaging, one seeks to balance throughput and background rejection to optimize measurement signal-to-noise ratios. Many sources affect transmission and emission in infrared imaging behind the Keck Observatory’s adaptive optics systems, such as telescope segments, segment gaps, secondary support structure, and AO bench optics. Here we describe an experiment, using the pupil-viewing mode of NIRC2, to image the pupil plane as a function of wavelength. We are developing an empirical model of throughput and background emission as a function of position in the pupil plane. This model will be used in part to inform the optimal design of cold pupils in future instruments, such as the new imaging camera for OSIRIS.

Paper Details

Date Published: 9 August 2016
PDF: 6 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 990835 (9 August 2016); doi: 10.1117/12.2233068
Show Author Affiliations
Pauline Arriaga, Univ. of California, Los Angeles (United States)
Michael P. Fitzgerald, Univ. of California, Los Angeles (United States)
James E. Lyke, W. M. Keck Observatory (United States)
Randall D. Campbell, W. M. Keck Observatory (United States)
Peter L. Wizinowich, W. M. Keck Observatory (United States)
Sean M. Adkins, W. M. Keck Observatory (United States)
Keith Y. Matthews, California Institute of Technology (United States)

Published in SPIE Proceedings Vol. 9908:
Ground-based and Airborne Instrumentation for Astronomy VI
Christopher J. Evans; Luc Simard; Hideki Takami, Editor(s)

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