Diamond machining of two-in-one optical element including slice mirror array for near-infrared integral-field spectrograph

Masahiro Takeda; Kousuke Kushibiki; Takuya Hosobata; Yutaka Yamagata; Shinya Morita; Takao Saiki; Keiichi Nakagawa; Yutaka Ohtake; Kentaro Motohara; Shinobu Ozaki; Toshihiro Tsuzuki; Hidenori Takahashi; Masahiro Konishi

doi:10.1117/12.2625703

29 August 2022 Diamond machining of two-in-one optical element including slice mirror array for near-infrared integral-field spectrograph

Masahiro Takeda, Kousuke Kushibiki, Takuya Hosobata, Yutaka Yamagata, Shinya Morita, Takao Saiki, Keiichi Nakagawa, Yutaka Ohtake, Kentaro Motohara, Shinobu Ozaki, Toshihiro Tsuzuki, Hidenori Takahashi, Masahiro Konishi

Author Affiliations +

Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; 121882X (2022) https://doi.org/10.1117/12.2625703
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

A two-in-one optical element consisting of a planar pick-off mirror (16×14 mm²) and a slice mirror array (twentysix 0.52 mm-wide and 18 mm-long mirror facets) was developed as a component for a near-infrared integral field unit: SWIMS-IFU for a near-infrared imager and spectrograph SWIMS for TAO 6.5 m telescope. The two optical entities were formed on a single bulk of aluminum alloy using a 5-axis ultraprecision machine and a specialized pair of diamond cutting tools. The relative position and orientation of the two optical entities were controlled to satisfy the tight optical tolerance, by precise measurement of tool tip positions with respect to the axes of the machine tool. Regarding measurement, an X-ray CT scanner was introduced as a solution to a major problem in the evaluation of complex monolithic optics, where some facets cannot be measured due to geometric constraints. The diamond-machining and measurement methods proposed in this study will be useful also for more complex monolithic optics to be developed in the future.

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Masahiro Takeda, Kousuke Kushibiki, Takuya Hosobata, Yutaka Yamagata, Shinya Morita, Takao Saiki, Keiichi Nakagawa, Yutaka Ohtake, Kentaro Motohara, Shinobu Ozaki, Toshihiro Tsuzuki, Hidenori Takahashi, and Masahiro Konishi "Diamond machining of two-in-one optical element including slice mirror array for near-infrared integral-field spectrograph", Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V, 121882X (29 August 2022); https://doi.org/10.1117/12.2625703

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