Field-imaging far-infrared line spectrometer FIFI LS

W. Raab, N. Geis, L. Looney, A. Poglitsch, D. Rosenthal, A. Urban, T. Henning, J. W. Beeman

Research output: Contribution to journalConference articlepeer-review


We present our design for a field-imaging, far-infrared line spectrometer for the SOFIA airborne observatory. The instrument will employ two parallel, medium resolution (R approximately 1700) grating spectrometers for simultaneous observations in the wavelength bands 42-110 μm and 110-210 μm. The Littrov mounted gratings are operated in 1st and 2nd order. Large stressed and unstressed 16×25 pixel Ge:Ga photoconductor arrays are operated in the spectrometer channel, providing good spectral coverage with high responsivity. Image slicers in each spectrometer branch redistribute the 5×5 pixel field of view along the 1×25 pixel entrance slits of the spectrographs, providing both, spatial and spectral multiplexing. Thus, 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, with an estimated sensitivity of approximately 2×10-15 W Hz-1/2 per pixel.

Original languageEnglish (US)
Pages (from-to)86-96
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1999
Externally publishedYes
EventProceedings of the 1999 Infrared Spaceborne Remote Sensing VII - Denver, CO, USA
Duration: Jul 21 1999Jul 23 1999

ASJC Scopus subject areas

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


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