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Proceedings Paper

Concept and optical design of the near-infrared integral field unit for SWIMS
Author(s): Yutaro Kitagawa; Shinobu Ozaki; Kentaro Motohara; Masahiro Konishi; Hidenori Takahashi; Ken Tateuchi; Soya Todo; Natsuko Kato; Tomohiro Yoshikawa
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Paper Abstract

SWIMS-IFU is an integral field unit for a near-infrared imaging spectrograph SWIMS (Simultaneous-color Wide-field Infrared Multi-object Spectrograph), which is being developed as one of the first-generation instruments for the University of Tokyo Atacama Observatory (TAO) 6.5-m infrared telescope and will be also mounted on the Cassegrain focus of the Subaru telescope in its initial phase (2015-). As SWIMS has a wide wavelength coverage which is implemented by a dichroic mirror placed into the collimated beam which splitting it into blue (0.9-1.4 μm) and red (1.4-2.5 μm) arms, the IFU module enables us to simultaneously obtain spatially resolved entire NIR spectrum from 0.9 to 2.5 μm in a wide-field of view of 14 ′′ x 10.′′4. The concept of the IFU module is "easy realization" of an integral filed spectroscopy (IFS) mode without modification of an existing spectrograph optics. Our IFU can be installed in a mask storage of SWIMS like other slit mask holders, so we can easily carry out IFS observation by just inserting the IFU module into a focal plane stage. The IFU optics consists of a pre-optics, an image slicer, a pupil mirror array, and a pseudo-slit mirror array. All the components will be aligned on an aluminum frame which has a floor size of < 170mm x 220mm) and a height of <60mm. Compared to existing near-infrared IFU instruments, our IFU has wider field coverage and is more sensitive for extended sources due to its coarser spatial sampling optimized for seeing-limited observations. In this paper, we report the concept and detailed optical design of the SWIMS-IFU.

Paper Details

Date Published: 7 August 2014
PDF: 9 pages
Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91514P (7 August 2014); doi: 10.1117/12.2054719
Show Author Affiliations
Yutaro Kitagawa, The Univ. of Tokyo (Japan)
Shinobu Ozaki, National Astronomical Observatory of Japan (Japan)
Kentaro Motohara, The Univ. of Tokyo (Japan)
Masahiro Konishi, The Univ. of Tokyo (Japan)
Hidenori Takahashi, The Univ. of Tokyo (Japan)
Ken Tateuchi, The Univ. of Tokyo (Japan)
Soya Todo, The Univ. of Tokyo (Japan)
Natsuko Kato, The Univ. of Tokyo (Japan)
Tomohiro Yoshikawa, Koyama Astronomical Observatory (Japan)

Published in SPIE Proceedings Vol. 9151:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Ramón Navarro; Colin R. Cunningham; Allison A. Barto, Editor(s)

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