R=200,000 NIR cross-dispersed echelle spectrograph realized by germanium immersion grating and all-cordierite reflective optical system

Yuki Sarugaku; Shogo Otsubo; Tomomi Takeuchi; Hideyo Kawakita; Hideo Sagawa; Yuji Ikeda; Hitoshi Tokoro; Tomoyasu Yamamuro; Sohei Kondo; Chikako Yasui; Satoshi Hamano

doi:10.1117/12.3019803

18 July 2024 R=200,000 NIR cross-dispersed echelle spectrograph realized by germanium immersion grating and all-cordierite reflective optical system

Yuki Sarugaku, Shogo Otsubo, Tomomi Takeuchi, Hideyo Kawakita, Hideo Sagawa, Yuji Ikeda, Hitoshi Tokoro, Tomoyasu Yamamuro, Sohei Kondo, Chikako Yasui, Satoshi Hamano

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130967X (2024) https://doi.org/10.1117/12.3019803
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

High-resolution infrared spectroscopy is a powerful tool for atmospheric science of solar system objects. Cross-dispersed echelle spectrographs with R = 50,000−100,000, which are commonly used today, have enabled us to detect minor species and determine their mixing ratios in planetary atmospheres down to the several ppb level. To survey even smaller amounts but scientifically significant molecular species, especially isotopologues of minor molecules, another higher spectral resolution and/or sensitivity is essential. Additionally, the implementation of a long-period monitoring is also essential for atmospheric science to observe atmospheric phenomena that vary over various time scales. High-resolution spectrographs for small-aperture telescopes, where it is relatively easy to obtain observation time, are demanded. To meet such requirements, we are developing a compact R=200,000 cross-dispersed echelle spectrograph for K- and L-bands. The spectrograph is so compact (950 mm × 660 mm × 510 mm) that it can be mounted at the Cassegrain focus of 1-m class telescopes. The downsizing and high sensitivity are realized by two germanium immersion gratings manufactured by Canon Inc. (used for both the main and cross dispersers) and an all-reflective optical system made entirely of fine cordierite (CO-720 and CO-220 by KYOCERA Corporation), which is a ceramic with a very low thermal expansion coefficient. This development intends not only scientific studies but also technology demonstrations of the two technologies, which are expected to be widely used in future infrared astronomy.

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

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Yuki Sarugaku, Shogo Otsubo, Tomomi Takeuchi, Hideyo Kawakita, Hideo Sagawa, Yuji Ikeda, Hitoshi Tokoro, Tomoyasu Yamamuro, Sohei Kondo, Chikako Yasui, and Satoshi Hamano "R=200,000 NIR cross-dispersed echelle spectrograph realized by germanium immersion grating and all-cordierite reflective optical system", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130967X (18 July 2024); https://doi.org/10.1117/12.3019803

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