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20 June 2000 Realizing 3D spectral imaging in the far-infrared: FIFI LS
Leslie W. Looney, Norbert Geis, Reinhard Genzel, Won Kee Park, Albrecht Poglitsch, Walfried Raab, Dirk Rosenthal, Alexander Urban, Thomas Henning
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Proceedings Volume 4014, Airborne Telescope Systems; (2000) https://doi.org/10.1117/12.389112
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany
Abstract
We present a progress report on the design and construction of the Field-Imaging Far-Infrared Line Spectrometer (FIFI LS) for the SOFIA airborne observatory. The design of the instrument is driven by the goal of maximizing observing efficiency, especially for observations of faint, extragalactic objects. Thus, FIFI LS utilizes an integral field technique that uses slicer mirrors to optically re- arrange the 2D field into a single slit for a long slit spectrometer. Effectively, a 5 X 5 pixel spatial field of view is imaged to a 25 X 1 pixel slit and dispersed to a 25 X 16 pixel, 2D detector array, providing diffraction- limited spatial and spectral multiplexing. In this manner, the instrument employs two parallel, medium resolution (R approximately 2000) grating spectrometers for simultaneous observations in two bands: a short wavelength band (42 to 110 micrometers ) and a long wavelength band (110 to 210 micrometers ). Overall, for each of the 25 spatial pixels, the instrument can cover a velocity range of approximately 1500 km/s around selected far-infrared lines with an estimated sensitivity of 2 X 10-15 W Hz1/2 per pixel. This arrangement provides good spectral coverage with high responsivity.
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Leslie W. Looney, Norbert Geis, Reinhard Genzel, Won Kee Park, Albrecht Poglitsch, Walfried Raab, Dirk Rosenthal, Alexander Urban, and Thomas Henning "Realizing 3D spectral imaging in the far-infrared: FIFI LS", Proc. SPIE 4014, Airborne Telescope Systems, (20 June 2000); https://doi.org/10.1117/12.389112
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KEYWORDS
Spectroscopy
Mirrors
Liquids
Diffraction gratings
Helium
Detector arrays
Nitrogen
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