The Infrared Imaging Spectrograph (IRIS) for TMT: new imager optical design with H4RG-15 detectors

Yoko Tanaka; Ryuji Suzuki; Masayuki Hattori; Yoshiyuki Obuchi; Fumihiro Uraguchi

doi:10.1117/12.3019139

18 July 2024 The Infrared Imaging Spectrograph (IRIS) for TMT: new imager optical design with H4RG-15 detectors

Yoko Tanaka, Ryuji Suzuki, Masayuki Hattori, Yoshiyuki Obuchi, Fumihiro Uraguchi

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 1309651 (2024) https://doi.org/10.1117/12.3019139
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

IRIS (InfraRed Imaging Spectrograph) is one of the first light instruments for the Thirty Meter Telescope which, with the help of adaptive optics, offers diffraction-limited near-infrared(0.84 to 2.4 μm) imaging and integral field spectroscopic capabilities. The imager optics design was based on four Teledyne H4RG-10 detectors with a pixel size of 10 microns. However, due to the cost and schedule uncertainty related to acquiring 64-channel H4RG-10 detectors which arose in the final design phase, a re-design of the optics to work with H4RG-15 detectors was initiated to investigate a possible optical design baseline. The major challenge of the optical design is a limited space available due to maturity of other IRIS subsystems in the final design phase while the focal length of the camera optics becomes 1.5 times longer. After extensively exploring the design parameter and trade space, we manage to introduce the new design which is based on two-mirror telephoto camera optics. The new design not only meets all requirements but also offers advantages, including two less aspheric mirrors and less detector tilt angle. Further analyses associated with the alignment strategy confirm that the new design is robust and implementable.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yoko Tanaka, Ryuji Suzuki, Masayuki Hattori, Yoshiyuki Obuchi, and Fumihiro Uraguchi "The Infrared Imaging Spectrograph (IRIS) for TMT: new imager optical design with H4RG-15 detectors", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 1309651 (18 July 2024); https://doi.org/10.1117/12.3019139

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