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Proceedings Paper

The Infrared Imaging Spectrograph (IRIS) for TMT: the ADC optical design
Author(s): Andrew C. Phillips; Ryuji Suzuki; James E. Larkin; Anna M. Moore; Yutaka Hayano; Toshihiro Tsuzuki; Shelley A. Wright
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Paper Abstract

We present the current optical design for the IRIS Atmospheric Dispersion Corrector (ADC). The ADC is designed for residual dispersions less than ~1 mas across a given passband at elevations of 25 degrees. Since the last report, the area of the IRIS Imager has increased by a factor of four, and the pupil size has increased from 75 to 90mm, both of which contribute to challenges with the design. Several considerations have led to the current design: residual dispersion, amount of introduced distortion, glass transmission, glass availability, and pupil displacement. In particular, it was found that there are significant distortions that appear (two different components) that can lead to image blur over long exposures. Also, pupil displacement increases the wave front error at the imager focus. We discuss these considerations, discuss the compromises, and present the final design choice and expected performance.

Paper Details

Date Published: 9 August 2016
PDF: 9 pages
Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 9908A1 (9 August 2016); doi: 10.1117/12.2232952
Show Author Affiliations
Andrew C. Phillips, Univ. of California Observatories (United States)
Ryuji Suzuki, National Astronomical Observatory of Japan (United States)
James E. Larkin, Univ. of California, Los Angeles (United States)
Anna M. Moore, Caltech Optical Observatoires (United States)
Yutaka Hayano, National Astronomical Observatory of Japan (Japan)
Toshihiro Tsuzuki, National Astronomical Observatory of Japan (Japan)
Shelley A. Wright, Univ. of California, San Diego (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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