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The infrared imaging spectrograph (IRIS) for TMT: design of image slicer

Zhang, Kai and Zhou, Yifei and Moore, Anna M. and Chisholm, Eric and Larkin, James E. and Wright, Shelley and Zhu, Yongtian and Reiley, Daniel J. and Hu, Zhongwen (2018) The infrared imaging spectrograph (IRIS) for TMT: design of image slicer. In: Ground-based and Airborne Instrumentation for Astronomy VII. Proceedings of SPIE. No.10702. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 107029A. ISBN 9781510619579.

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The InfraRed Imaging Spectrograph (IRIS) is one of three first light science instruments for the Thirty Meter Telescope (TMT). It will provide dedicated function of imaging and integral field spectroscopic observations in parallel with the assistance of a Narrow Field InfraRed Adaptive Optics System (NFIRAOS). The IRIS imager delivers celestial light to a dual-channel Integral Field Spectrograph (IFS) through a pair of pick-off mirrors in the central field. The IFS creates multi-functional ability to explore the universe in IR (0.84 – 2.4um) with moderate spectral resolution of R=4,000/8,000 and four spaxel scales of 4, 9, 25, 50 milli-arc-seconds (mas). An image slicer serves one of the two spectral channels as its Integral Field Unit (IFU) in two coarse spaxel scales of 25 and 50mas over the continuous science fields of 2.2x1.125 arc-seconds (arcsec) and 4.4x2.25 arcsec respectively. It splits the field to 88 unit systems, and then re-images at two parallel slits in order to take full advantage of the detector (4Kx4K @ 15um). This paper describes a novel all-reflective design of image slicer, which uses a new ‘brick stage’ layout to stagger the adjacent mirrors and deliver image quality close to diffraction limit. The quasi-telecentric optical design gives more friendly interfaces with pre-optics and spectrograph than the conceptual design. Here, more technical issues are discussed to guide the further study on optical performance and fabrication feasibility.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Moore, Anna M.0000-0002-2894-6936
Larkin, James E.0000-0001-7687-3965
Wright, Shelley0000-0003-1034-8054
Additional Information:© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE). This work is supported by the TMT project office, IRIS design group, Nanjing Institute of Astronomical Optics and Technology (NIAOT), the National Astronomical Observatory of China (NAOC) and the Chinese Academy of Sciences (CAS). It gets funding support from the Chinese Scholarship Council (CSC) (201704910452, 2017.12-2018.06), the Bureau of Personnel of CAS (2013.9-2014.08), National Natural Science Foundation of China (NSFC) project (U1531133), (11773047), the Natural Science Foundation of Jiangsu province (BK20151065), the special funds for equipment renewal at astronomical observatory and major equipment operation (2015), the knowledge innovation engineering in young talents field, NIAOT (2014.12-2017.12) and the Youth Innovation Promotion Association, CAS. Here, we sincerely give our thanks to all the members of TMT-IRIS design group, especially Anna M. Moore, who led the design work of slicer IFS at the PDP and settled to the Advanced Instrumentation and Technology Centre, Australian National University in 2017.
Group:Thirty Meter Telescope
Funding AgencyGrant Number
Thirty Meter Telescope ProjectUNSPECIFIED
Nanjing Institute of Astronomical Optics and TechnologyUNSPECIFIED
National Astronomical Observatories, Chinese Academy of Sciences (NAOC)UNSPECIFIED
Chinese Scholarship Council201704910452
National Natural Science Foundation of ChinaU1531133
National Natural Science Foundation of China11773047
Natural Science Foundation of Jiangsu ProvinceBK20151065
Youth Innovation Promotion AssociationUNSPECIFIED
Subject Keywords:Thirty Meter Telescope, Infrared Imaging Spectrograph, Integral Field Unit, Image Slicer
Series Name:Proceedings of SPIE
Issue or Number:10702
Record Number:CaltechAUTHORS:20190103-153504200
Persistent URL:
Official Citation:Kai Zhang, Yifei Zhou, Anna M. Moore, Eric Chisholm, James E. Larkin, Shelley Wright, Yongtian Zhu, Daniel J. Reiley, Zhongwen Hu, "The infrared imaging spectrograph (IRIS) for TMT: design of image slicer," Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107029A (13 July 2018); doi: 10.1117/12.2312700
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92055
Deposited By: George Porter
Deposited On:08 Jan 2019 21:43
Last Modified:16 Nov 2021 03:46

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