Fabrication of a wide-field NIR integral field unit for SWIMS using ultra-precision cutting

Yutaro Kitagawa; Yutaka Yamagata; Shin-ya Morita; Kentaro Motohara; Shinobu Ozaki; Hidenori Takahashi; Masahiro Konishi; Natsuko M. Kato; Yutaka Kobayakawa; Yasunori Terao; Hirofumi Ohashi

doi:10.1117/12.2231931

22 July 2016 Fabrication of a wide-field NIR integral field unit for SWIMS using ultra-precision cutting

Yutaro Kitagawa, Yutaka Yamagata, Shin-ya Morita, Kentaro Motohara, Shinobu Ozaki, Hidenori Takahashi, Masahiro Konishi, Natsuko M. Kato, Yutaka Kobayakawa, Yasunori Terao, Hirofumi Ohashi

Author Affiliations +

Proceedings Volume 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II; 991225 (2016) https://doi.org/10.1117/12.2231931
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

We describe overview of fabrication methods and measurement results of test fabrications of optical surfaces for an integral ﬁeld unit (IFU) for Simultaneous color Wide-ﬁeld Infrared Multi-object Spectrograph, SWIMS, which is a ﬁrst-generation instrument for the University of Tokyo Atacama Observatory 6.5-m telescope. SWIMS-IFU provides entire near-infrared spectrum from 0.9 to 2.5 μm simultaneously covering wider ﬁeld of view of 17" × 13" compared with current near-infrared IFUs. We investigate an ultra-precision cutting technique to monolithically fabricate optical surfaces of IFU optics such as an image slicer. Using 4- or 5-axis ultra precision machine we compare the milling process and shaper cutting process to ﬁnd the best way of fabrication of image slicers. The measurement results show that the surface roughness almost satisﬁes our requirement in both of two methods. Moreover, we also obtain ideal surface form in the shaper cutting process. This method will be adopted to other mirror arrays (i.e. pupil mirror and slit mirror, and such monolithic fabrications will also help us to considerably reduce alignment procedure of each optical elements.

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Yutaro Kitagawa, Yutaka Yamagata, Shin-ya Morita, Kentaro Motohara, Shinobu Ozaki, Hidenori Takahashi, Masahiro Konishi, Natsuko M. Kato, Yutaka Kobayakawa, Yasunori Terao, and Hirofumi Ohashi "Fabrication of a wide-field NIR integral field unit for SWIMS using ultra-precision cutting", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 991225 (22 July 2016); https://doi.org/10.1117/12.2231931

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