7 August 2014 Concept and optical design of the near-infrared integral field unit for SWIMS
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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.
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Yutaro Kitagawa, Yutaro Kitagawa, Shinobu Ozaki, Shinobu Ozaki, Kentaro Motohara, Kentaro Motohara, Masahiro Konishi, Masahiro Konishi, Hidenori Takahashi, Hidenori Takahashi, Ken Tateuchi, Ken Tateuchi, Soya Todo, Soya Todo, Natsuko Kato, Natsuko Kato, Tomohiro Yoshikawa, Tomohiro Yoshikawa, } "Concept and optical design of the near-infrared integral field unit for SWIMS", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91514P (7 August 2014); doi: 10.1117/12.2054719; https://doi.org/10.1117/12.2054719
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