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Proceedings Paper

FIFI LS: the far-infrared integral field spectrometer for SOFIA
Author(s): Walfried Raab; Albrecht Poglitsch; Leslie W. Looney; Randolf Klein; Norbert Geis; Rainer Hoenle; Werner Viehhauser; Reinhard Genzel; Murad Hamidouche; Thomas Henning; Eugene E. Haller
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Paper 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 5x5 pixel field of view into the 1x25 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 25x16 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.

Paper Details

Date Published: 30 September 2004
PDF: 12 pages
Proc. SPIE 5492, Ground-based Instrumentation for Astronomy, (30 September 2004); doi: 10.1117/12.550435
Show Author Affiliations
Walfried Raab, Max-Planck-Institut fur extraterrestrische Physik (Germany)
Albrecht Poglitsch, Max-Planck-Institut fur extraterrestrische Physik (Germany)
Leslie W. Looney, Univ. of Illinois/Urbana-Champaign (United States)
Randolf Klein, Max-Planck-Institut fur extraterrestrische Physik (Germany)
Norbert Geis, Max-Planck-Institut fur extraterrestrische Physik (Germany)
Rainer Hoenle, Max-Planck-Institut fur extraterrestrische Physik (Germany)
Werner Viehhauser, Max-Planck-Institut fur extraterrestrische Physik (Germany)
Reinhard Genzel, Max-Planck-Institut fur extraterrestrische Physik (Germany)
Murad Hamidouche, Univ. of Illinois/Urbana-Champaign (United States)
Thomas Henning, Max-Planck-Institut fur Astronomie (Germany)
Eugene E. Haller, Univ. of California/Berkeley (United States)


Published in SPIE Proceedings Vol. 5492:
Ground-based Instrumentation for Astronomy
Alan F. M. Moorwood; Masanori Iye, Editor(s)

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