Fabrication of mirror arrays with an ultra-precision cutting technique for a near-infrared integral field unit SWIMS-IFU

Kosuke Kushibiki; Takuya Hosobata; Masahiro Takeda; Yutaka Yamagata; Shin-ya Morita; Kentaro Motohara; Shinobu Ozaki; Toshihiro Tsuzuki; Hidenori Takahashi; Yukihiro Kono; Masahiro Konishi; Natsuko M. Kato; Yasunori Terao; Hiroki Nakamura

doi:10.1117/12.2560431

13 December 2020 Fabrication of mirror arrays with an ultra-precision cutting technique for a near-infrared integral field unit SWIMS-IFU

Kosuke Kushibiki, Takuya Hosobata, Masahiro Takeda, Yutaka Yamagata, Shin-ya Morita, Kentaro Motohara, Shinobu Ozaki, Toshihiro Tsuzuki, Hidenori Takahashi, Yukihiro Kono, Masahiro Konishi, Natsuko M. Kato, Yasunori Terao, Hiroki Nakamura

Author Affiliations +

Proceedings Volume 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV; 114512Y (2020) https://doi.org/10.1117/12.2560431
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

We are developing an image-slicer type integral field unit (IFU), SWIMS-IFU, for SWIMS (Simultaneous-color Wide-field Infrared Multi-object Spectrograph), a near-infrared instrument for TAO 6.5 m telescope. SWIMS- IFU divides a field-of-view of 16:006 12:008 into 26 slices with a width of 0:005, which is the largest FoV among near-infrared IFUs on 8 m class telescopes. It is also capable of obtaining entire near-infrared spectra from 0.9 to 2.5 m with R1000 with a single exposure. Because of limitations of space in SWIMS, SWIMS-IFU should fit in a volume of 170 x 220 x 60 mm3, which results in small and complicatedly aligned mirror facets. To reduce alignment procedures, we adopt an ultra-precision cutting technique to fabricate mirror arrays monolithically. We have completed one of the mirror arrays, the slit-mirror array which consists of 26 spherical mirror facets, and confirmed both their surface roughness and shape errors satisfy the requirements. We also have fabricated a prototype of the pupil-mirror array including some elliptical mirror facets and confirmed that the elliptical mirrors have enough surface qualities and produce better image quality than spherical ones by a pinhole imaging test.

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Kosuke Kushibiki, Takuya Hosobata, Masahiro Takeda, Yutaka Yamagata, Shin-ya Morita, Kentaro Motohara, Shinobu Ozaki, Toshihiro Tsuzuki, Hidenori Takahashi, Yukihiro Kono, Masahiro Konishi, Natsuko M. Kato, Yasunori Terao, and Hiroki Nakamura "Fabrication of mirror arrays with an ultra-precision cutting technique for a near-infrared integral field unit SWIMS-IFU", Proc. SPIE 11451, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation IV, 114512Y (13 December 2020); https://doi.org/10.1117/12.2560431

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