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9 August 2016 The Infrared Imaging Spectrograph (IRIS) for TMT: the ADC optical design
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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.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Andrew C. Phillips, Ryuji Suzuki, James E. Larkin, Anna M. Moore, Yutaka Hayano, Toshihiro Tsuzuki, and Shelley A. Wright "The Infrared Imaging Spectrograph (IRIS) for TMT: the ADC optical design", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 9908A1 (9 August 2016);

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