FIFI LS: The far-infrared integral field spectrometer for SOFIA

W. Raab; A. Poglitsch; L. W. Looney; R. Klein; N. Geis; R. Hoenle; W. Viehhauser; R. Genzel; M. Hamidouche; T. Henning; E. E. Haller

doi:10.1117/12.550435

FIFI LS: The far-infrared integral field spectrometer for SOFIA

W. Raab, A. Poglitsch, L. W. Looney, R. Klein, N. Geis, R. Hoenle, W. Viehhauser, R. Genzel, M. Hamidouche, T. Henning, E. E. Haller

Astronomy

Research output: Contribution to journal › Conference article › peer-review

Abstract

FIFI LS is a far-infrared integral field spectrometer for the SOFIA airborne observatory. The instrument is designed to maximize the observing efficiency by simultaneous and nearly independent imaging of the field of view in two medium spectral resolution bands. Both spectral channels - covering a wavelength range of 42 to 110 microns and 110 to 210 microns respectively - allow diffraction limited spectral imaging. Reflective image slicers rearrange the 5×5 pixel field of view into the 1×25 pixel entrance slit of a grating spectrograph. Littrow mounted gratings with anamorphic collimators are used for spectral multiplexing with a spectral resolution between R = 1400 - 6500, depending on observing wavelength. Each spectral band employs two large format 25×16 pixel Ge:Ga detector arrays, axially stressed for the long wavelength band to achieve a longer wavelength response and slightly stressed for the short wavelength band. For each of the 25 spatial pixels, we are able to cover a velocity range of approximately 1500 km/s around a selected far-infrared line. This arrangement provides good spectral coverage with high responsivity. We present a summary of the FIFI LS design and the current status of instrument integration.

Original language	English (US)
Pages (from-to)	1074-1085
Number of pages	12
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	5492
Issue number	PART 2
DOIs	https://doi.org/10.1117/12.550435
State	Published - 2004
Event	Ground-based Instrumentation for Astronomy - Glasgow, United Kingdom Duration: Jun 21 2004 → Jun 25 2004

Keywords

FIFI
FIFI LS
Far-Infrared
Integral Field Imaging
SOFIA
Spectrometer

ASJC Scopus subject areas

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

Online availability

10.1117/12.550435

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title = "FIFI LS: The far-infrared integral field spectrometer for SOFIA",

abstract = "FIFI LS is a far-infrared integral field spectrometer for the SOFIA airborne observatory. The instrument is designed to maximize the observing efficiency by simultaneous and nearly independent imaging of the field of view in two medium spectral resolution bands. Both spectral channels - covering a wavelength range of 42 to 110 microns and 110 to 210 microns respectively - allow diffraction limited spectral imaging. Reflective image slicers rearrange the 5×5 pixel field of view into the 1×25 pixel entrance slit of a grating spectrograph. Littrow mounted gratings with anamorphic collimators are used for spectral multiplexing with a spectral resolution between R = 1400 - 6500, depending on observing wavelength. Each spectral band employs two large format 25×16 pixel Ge:Ga detector arrays, axially stressed for the long wavelength band to achieve a longer wavelength response and slightly stressed for the short wavelength band. For each of the 25 spatial pixels, we are able to cover a velocity range of approximately 1500 km/s around a selected far-infrared line. This arrangement provides good spectral coverage with high responsivity. We present a summary of the FIFI LS design and the current status of instrument integration.",

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AU - Raab, W.

AU - Poglitsch, A.

AU - Looney, L. W.

AU - Klein, R.

AU - Geis, N.

AU - Hoenle, R.

AU - Viehhauser, W.

AU - Genzel, R.

AU - Hamidouche, M.

AU - Henning, T.

AU - Haller, E. E.

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AB - FIFI LS is a far-infrared integral field spectrometer for the SOFIA airborne observatory. The instrument is designed to maximize the observing efficiency by simultaneous and nearly independent imaging of the field of view in two medium spectral resolution bands. Both spectral channels - covering a wavelength range of 42 to 110 microns and 110 to 210 microns respectively - allow diffraction limited spectral imaging. Reflective image slicers rearrange the 5×5 pixel field of view into the 1×25 pixel entrance slit of a grating spectrograph. Littrow mounted gratings with anamorphic collimators are used for spectral multiplexing with a spectral resolution between R = 1400 - 6500, depending on observing wavelength. Each spectral band employs two large format 25×16 pixel Ge:Ga detector arrays, axially stressed for the long wavelength band to achieve a longer wavelength response and slightly stressed for the short wavelength band. For each of the 25 spatial pixels, we are able to cover a velocity range of approximately 1500 km/s around a selected far-infrared line. This arrangement provides good spectral coverage with high responsivity. We present a summary of the FIFI LS design and the current status of instrument integration.

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FIFI LS: The far-infrared integral field spectrometer for SOFIA

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