Development of an efficient three-channel IFU for high-speed time-domain spectroscopy onboard TriCCS at the Seimei telescope

Toshihiro Tsuzuki; Kazuya Matsubayashi; Mamoru Doi; Bungo Ikenoue; Naoki Kohara; Shinobu Ozaki; Kentaro Motohara; Shigeyuki Sako; Kouji Ohta; Keiichi Maeda

doi:10.1117/12.3018727

26 August 2024 Development of an efficient three-channel IFU for high-speed time-domain spectroscopy onboard TriCCS at the Seimei telescope

Toshihiro Tsuzuki, Kazuya Matsubayashi, Mamoru Doi, Bungo Ikenoue, Naoki Kohara, Shinobu Ozaki, Kentaro Motohara, Shigeyuki Sako, Kouji Ohta, Keiichi Maeda

Author Affiliations +

Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 131005E (2024) https://doi.org/10.1117/12.3018727
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

In time-domain astronomy, achieving high-speed optical spectroscopy within 10 seconds presents a significant challenge. We are developing an efficient three-channel, image slicer-type integral field unit (IFU) for the Seimei Telescope’s TriCCS instrument. To maximize throughput within the constraints of limited space, the IFU optics consist exclusively of a slicer unit and spherical mirrors that form an Offner optical system, omitting the magnification optics commonly used in conventional IFUs. The slicer unit employs a medium transmission slit in the transmission channel instead of an air slit, resulting in a 4.6 mm backward shift of the pseudofocal plane, which effectively reduces dust impact on the mirror at the image plane. Our design achieves both sufficient imaging performance and over 90% throughput in the 400–1000 nm wavelength range, despite the limited available space, making it adaptable to other slit spectroscopy instruments. This presentation provides an overview of the TriCCS IFU design and its current development status.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Toshihiro Tsuzuki, Kazuya Matsubayashi, Mamoru Doi, Bungo Ikenoue, Naoki Kohara, Shinobu Ozaki, Kentaro Motohara, Shigeyuki Sako, Kouji Ohta, and Keiichi Maeda "Development of an efficient three-channel IFU for high-speed time-domain spectroscopy onboard TriCCS at the Seimei telescope", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 131005E (26 August 2024); https://doi.org/10.1117/12.3018727

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