Modular plug-in extension enabling cross-dispersed spectroscopy for Large Binocular Telescope

Hyukmo Kang; David Thompson; Al Conrad; Conrad Vogel; Ariel Lamdan; Dae Wook Kim

doi:10.1117/12.2528865

Modular plug-in extension enabling cross-dispersed spectroscopy for Large Binocular Telescope

Hyukmo Kang, David Thompson, Al Conrad, Conrad Vogel, Ariel Lamdan, Dae Wook Kim

Optical Sciences

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

5 Scopus citations

Abstract

The LUCI (LBT Utility Camera in the Infrared) instruments are a pair of near infrared (NIR) imagers and spectrographs for the Large Binocular Telescope (LBT) that include a set of cryogenic exchangeable focal plane masks. Although LUCI covers the NIR zJHK bands at different resolutions with existing gratings, it is not currently possible to get zJHK in a single exposure with a single LUCI which is required for some planetary science programs. To produce a simultaneous zJHK spectrum with a single LUCI, we designed a system consisting of small and simple optical elements to fit within the limited space in the focal plane mask frame to cross-disperse fixed short slits. This system, called MOBIUS (Mask-Oriented Breadboard Implementation for Unscrambling Spectra), consists of a double-folding mirror, a collimating spherical mirror with 180 mm radius of curvature, and a dispersing prism with the rear surface mirror-coated. MOBIUS disperses the input slit perpendicular to the dispersion direction of the gratings in LUCI. The resulting order separation is at least ∼2.7 arcsecond, allowing a slit length of up to ∼2.3 arcsec without mixing orders at the LUCI image plane. Since MOBIUS would be introduced into the existing light path via the exchangeable slit mask mechanism, no modification to the current LUCI instrument is needed. Eventually, binocular observations combining one of the Multi-Object Double Spectrographs (MODS) with LUCI+MOBIUS at the LBT will provide simultaneous coverage from 0.3 to 2.4 μm for studies of asteroids and other faint solar system bodies.

Original language	English (US)
Title of host publication	Astronomical Optics
Subtitle of host publication	Design, Manufacture, and Test of Space and Ground Systems II
Editors	Tony B. Hull, Dae Wook Kim, Pascal Hallibert
Publisher	SPIE
ISBN (Electronic)	9781510629257
DOIs	https://doi.org/10.1117/12.2528865
State	Published - 2019
Event	Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II 2019 - San Diego, United States Duration: Aug 12 2019 → Aug 15 2019

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	11116
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II 2019
Country/Territory	United States
City	San Diego
Period	8/12/19 → 8/15/19

Keywords

Cross dispersion
Instrument Design
LBT
LUCI
Spectrograph

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

Access to Document

10.1117/12.2528865

Cite this

Kang, H., Thompson, D., Conrad, A., Vogel, C., Lamdan, A., & Kim, D. W. (2019). Modular plug-in extension enabling cross-dispersed spectroscopy for Large Binocular Telescope. In T. B. Hull, D. W. Kim, & P. Hallibert (Eds.), Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II Article 1111606 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11116). SPIE. https://doi.org/10.1117/12.2528865

Modular plug-in extension enabling cross-dispersed spectroscopy for Large Binocular Telescope. / Kang, Hyukmo; Thompson, David; Conrad, Al et al.
Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II. ed. / Tony B. Hull; Dae Wook Kim; Pascal Hallibert. SPIE, 2019. 1111606 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11116).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Kang, H, Thompson, D, Conrad, A, Vogel, C, Lamdan, A & Kim, DW 2019, Modular plug-in extension enabling cross-dispersed spectroscopy for Large Binocular Telescope. in TB Hull, DW Kim & P Hallibert (eds), Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II., 1111606, Proceedings of SPIE - The International Society for Optical Engineering, vol. 11116, SPIE, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II 2019, San Diego, United States, 8/12/19. https://doi.org/10.1117/12.2528865

Kang H, Thompson D, Conrad A, Vogel C, Lamdan A, Kim DW. Modular plug-in extension enabling cross-dispersed spectroscopy for Large Binocular Telescope. In Hull TB, Kim DW, Hallibert P, editors, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II. SPIE. 2019. 1111606. (Proceedings of SPIE - The International Society for Optical Engineering). doi: 10.1117/12.2528865

Kang, Hyukmo ; Thompson, David ; Conrad, Al et al. / Modular plug-in extension enabling cross-dispersed spectroscopy for Large Binocular Telescope. Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II. editor / Tony B. Hull ; Dae Wook Kim ; Pascal Hallibert. SPIE, 2019. (Proceedings of SPIE - The International Society for Optical Engineering).

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abstract = "The LUCI (LBT Utility Camera in the Infrared) instruments are a pair of near infrared (NIR) imagers and spectrographs for the Large Binocular Telescope (LBT) that include a set of cryogenic exchangeable focal plane masks. Although LUCI covers the NIR zJHK bands at different resolutions with existing gratings, it is not currently possible to get zJHK in a single exposure with a single LUCI which is required for some planetary science programs. To produce a simultaneous zJHK spectrum with a single LUCI, we designed a system consisting of small and simple optical elements to fit within the limited space in the focal plane mask frame to cross-disperse fixed short slits. This system, called MOBIUS (Mask-Oriented Breadboard Implementation for Unscrambling Spectra), consists of a double-folding mirror, a collimating spherical mirror with 180 mm radius of curvature, and a dispersing prism with the rear surface mirror-coated. MOBIUS disperses the input slit perpendicular to the dispersion direction of the gratings in LUCI. The resulting order separation is at least ∼2.7 arcsecond, allowing a slit length of up to ∼2.3 arcsec without mixing orders at the LUCI image plane. Since MOBIUS would be introduced into the existing light path via the exchangeable slit mask mechanism, no modification to the current LUCI instrument is needed. Eventually, binocular observations combining one of the Multi-Object Double Spectrographs (MODS) with LUCI+MOBIUS at the LBT will provide simultaneous coverage from 0.3 to 2.4 μm for studies of asteroids and other faint solar system bodies.",

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AB - The LUCI (LBT Utility Camera in the Infrared) instruments are a pair of near infrared (NIR) imagers and spectrographs for the Large Binocular Telescope (LBT) that include a set of cryogenic exchangeable focal plane masks. Although LUCI covers the NIR zJHK bands at different resolutions with existing gratings, it is not currently possible to get zJHK in a single exposure with a single LUCI which is required for some planetary science programs. To produce a simultaneous zJHK spectrum with a single LUCI, we designed a system consisting of small and simple optical elements to fit within the limited space in the focal plane mask frame to cross-disperse fixed short slits. This system, called MOBIUS (Mask-Oriented Breadboard Implementation for Unscrambling Spectra), consists of a double-folding mirror, a collimating spherical mirror with 180 mm radius of curvature, and a dispersing prism with the rear surface mirror-coated. MOBIUS disperses the input slit perpendicular to the dispersion direction of the gratings in LUCI. The resulting order separation is at least ∼2.7 arcsecond, allowing a slit length of up to ∼2.3 arcsec without mixing orders at the LUCI image plane. Since MOBIUS would be introduced into the existing light path via the exchangeable slit mask mechanism, no modification to the current LUCI instrument is needed. Eventually, binocular observations combining one of the Multi-Object Double Spectrographs (MODS) with LUCI+MOBIUS at the LBT will provide simultaneous coverage from 0.3 to 2.4 μm for studies of asteroids and other faint solar system bodies.

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Modular plug-in extension enabling cross-dispersed spectroscopy for Large Binocular Telescope

Abstract

Publication series

Conference

Keywords

ASJC Scopus subject areas

Access to Document

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