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The infrared imaging spectrograph (IRIS) for TMT: design of image slicer
Kai Zhang1,2; Yifei Zhou1,2,3; Yongtian Zhu1,2; Zhongwen hu1,2
Conference NameSPIE Ground-based and Airborne Instrumentation for Astronomy VII(Vol.10702)
Source PublicationGround-based and Airborne Instrumentation for Astronomy VII
Conference Date2018-6-10
Conference PlaceAustin, Texas, United States
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.
KeywordThirty Meter Telescope Infrared Imaging Spectrograph Integral Field Unit Image Slicer
Subject Area天文技术与方法
Document Type会议论文
Recommended Citation
GB/T 7714
Kai Zhang,Yifei Zhou,Yongtian Zhu,et al. The infrared imaging spectrograph (IRIS) for TMT: design of image slicer[C],2018.
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