22 July 2016 Fabrication of a wide-field NIR integral field unit for SWIMS using ultra-precision cutting
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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, 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); doi: 10.1117/12.2231931; https://doi.org/10.1117/12.2231931
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