ID | 119265 |
Author |
Itoh, Satoshi
Japan Aerospace Exploration Agency
Ishihara, Daisuke
Japan Aerospace Exploration Agency
Wada, Takehiko
Japan Aerospace Exploration Agency
Nakagawa, Takao
Japan Aerospace Exploration Agency
Oyabu, Shinki
Tokushima University
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Kaneda, Hidehiro
Nagoya University
Hirahara, Yasuhiro
Nagoya University
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Keywords | spectrograph
high-dispersion
space-borne
mid-infrared
spectral resolving power
wave optics
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Content Type |
Journal Article
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Description | 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.
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Journal Title |
Journal of Astronomical Telescopes, Instruments, and Systems
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ISSN | 23294124
23294221
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NCID | AA12781164
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Publisher | SPIE
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Volume | 8
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Issue | 2
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Start Page | 025004
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Published Date | 2022-06-23
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Rights | © 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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EDB ID | |
DOI (Published Version) | |
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language |
eng
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TextVersion |
Publisher
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departments |
Liberal Arts and Sciences
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