Measuring the Near-IR Airglow Continuum with Stray Light Reduced Spectrograph
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Measuring the Near-IR Airglow Continuum with Stray Light Reduced Spectrograph. / Viuho, Joonas K. M.; Andersen, Michael I.; Fynbo, Johan P. U.
In: Proceedings of SPIE, Vol. 12184, 1218465, 29.08.2022.Research output: Contribution to journal › Conference article › Research › peer-review
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TY - GEN
T1 - Measuring the Near-IR Airglow Continuum with Stray Light Reduced Spectrograph
AU - Viuho, Joonas K. M.
AU - Andersen, Michael I.
AU - Fynbo, Johan P. U.
PY - 2022/8/29
Y1 - 2022/8/29
N2 - We present an experimental spectrograph based on a new type of a white pupil echelle spectrograph designed for interline sky continuum measurement. This is an application which requires extremely low instrumental scattered light background and high spectral fidelity due to the faintness of the signal and the fact that the night sky is illuminated by bright hydroxyl emission lines from the red-end of visual spectrum through near infrared wavelengths. The conceptual design is a white pupil echelle spectrograph using a single grating in double pass. The xy-plane of the optical beam is rotated between the two consecutive dispersions thus redirecting the scattered 'grating grass' light from the grating to different direction respective to the spectrum. A mask in the secondary focus prevents this scattered light reaching the camera. The beam rotation is achieved with a normal right-angle prism allowing us to use off-the-shelf optical components and classical geometrical optics to mitigate the issue of hydroxyl airglow emission lines.
AB - We present an experimental spectrograph based on a new type of a white pupil echelle spectrograph designed for interline sky continuum measurement. This is an application which requires extremely low instrumental scattered light background and high spectral fidelity due to the faintness of the signal and the fact that the night sky is illuminated by bright hydroxyl emission lines from the red-end of visual spectrum through near infrared wavelengths. The conceptual design is a white pupil echelle spectrograph using a single grating in double pass. The xy-plane of the optical beam is rotated between the two consecutive dispersions thus redirecting the scattered 'grating grass' light from the grating to different direction respective to the spectrum. A mask in the secondary focus prevents this scattered light reaching the camera. The beam rotation is achieved with a normal right-angle prism allowing us to use off-the-shelf optical components and classical geometrical optics to mitigate the issue of hydroxyl airglow emission lines.
KW - Airglow
KW - airglow continuum
KW - near infrared
KW - spectroscopy
KW - echelle
KW - spectral purity
KW - atmospheric emission
KW - OH SUPPRESSION
U2 - 10.1117/12.2630668
DO - 10.1117/12.2630668
M3 - Conference article
VL - 12184
JO - Progress in Biomedical Optics and Imaging
JF - Progress in Biomedical Optics and Imaging
SN - 1605-7422
M1 - 1218465
T2 - Conference on Ground-Based and Airborne Instrumentation for Astronomy IX
Y2 - 17 July 2022 through 22 July 2022
ER -
ID: 324553658