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30 September 2004 FIFI LS: the far-infrared integral field spectrometer for SOFIA
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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Proceedings Volume 5492, Ground-based Instrumentation for Astronomy; (2004) https://doi.org/10.1117/12.550435
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom
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.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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Walfried Raab, Albrecht Poglitsch, Leslie W. Looney, Randolf Klein, Norbert Geis, Rainer Hoenle, Werner Viehhauser, Reinhard Genzel, Murad Hamidouche, Thomas Henning, and Eugene E. Haller "FIFI LS: the far-infrared integral field spectrometer for SOFIA", Proc. SPIE 5492, Ground-based Instrumentation for Astronomy, (30 September 2004); https://doi.org/10.1117/12.550435
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KEYWORDS
Mirrors
Spectroscopy
Diffraction gratings
Cryogenics
Liquids
Sensors
Collimators
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