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ID 119265
著者
Itoh, Satoshi Japan Aerospace Exploration Agency
Ishihara, Daisuke Japan Aerospace Exploration Agency
Wada, Takehiko Japan Aerospace Exploration Agency
Nakagawa, Takao Japan Aerospace Exploration Agency
Kaneda, Hidehiro Nagoya University
Hirahara, Yasuhiro Nagoya University
キーワード
spectrograph
high-dispersion
space-borne
mid-infrared
spectral resolving power
wave optics
資料タイプ
学術雑誌論文
抄録
We performed wave-optics-based numerical simulations at mid-infrared wavelengths to investigate how the presence or absence of entrance slits and optical aberrations affect the spectral resolving power R of a compact, high-spectral-resolving-power spectrometer containing an immersion-echelle grating. We tested three cases of telescope aberration (aberration-free, astigmatism, and spherical aberration), assuming the aberration budget of the Space Infrared Telescope for Cosmology and Astrophysics, which has a 20μm wavelength diffraction limit. In cases with a slit, we found that the value of R at around 10 to 20 μm is approximately independent of the assumed aberrations, which is significantly different from the prediction of geometrical optics. Our results also indicate that diffraction from the slit improves R by enlarging the effective illuminated area on the grating window and that this improvement decreases at short wavelengths. For the slit-less cases, we found that the impact of aberrations on R can be roughly estimated using the Strehl ratio.
掲載誌名
Journal of Astronomical Telescopes, Instruments, and Systems
ISSN
23294124
23294221
cat書誌ID
AA12781164
出版者
SPIE
8
2
開始ページ
025004
発行日
2022-06-23
権利情報
© The Authors. Published by SPIE under a Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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出版社版DOI
出版社版URL
フルテキストファイル
言語
eng
著者版フラグ
出版社版
部局
教養教育院