Modeling the transmission and thermal emission in a pupil image behind the Keck II adaptive optics system

Pauline Arriaga, Michael P. Fitzgerald, James E. Lyke, Randall D. Campbell, Peter L. Wizinowich, Sean M. Adkins, Keith Y. Matthews, Christopher J. Evans, Luc Simard, Hideki Takami
2016 Ground-based and Airborne Instrumentation for Astronomy VI  
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 backgroundlimited imaging, one seeks to balance throughput and background rejection to optimize measurement signal-tonoise ratios. Many sources affect transmission and emission in infrared imaging behind the Keck Observatorys adaptive optics systems, such as telescope segments, segment
more » ... 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.
doi:10.1117/12.2233068 fatcat:cqj4cxsfunh7dbgnuoes4wyvsa