Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...597..628l&link_type=abstract
The Astrophysical Journal, Volume 597, Issue 1, pp. 628-643.
Astronomy and Astrophysics
Astronomy
4
Instrumentation: Spectrographs, Techniques: Image Processing, Techniques: Spectroscopic
Scientific paper
The optical design of an integral field spectrometer for far-infrared observations, the Far-Infrared Field-Imaging Line Spectrometer (FIFI LS), is presented. The instrument will fly on board the joint NASA/DLR airborne observatory SOFIA, observing in two nearly independent wavelength channels simultaneously: a blue channel (40-105 μm) and a red channel (105-210 μm). To achieve instantaneous integral field spectroscopy for the first time in the far-infrared, a novel reflective image slicer system is utilized that slices the 5×5 pixel, two-dimensional field of view into a pseudo-long slit of 25×1 pixels. The slicer assembly consists of three sets of five mirrors that have optical power, enabling a compact design. After the sky field has been optically rearranged to the pseudoslit, the image is spectrally dispersed in a standard Littrow-mounted reflective grating spectrometer. The practical concerns for the optical design in the far-infrared and, in particular, the significant effect of diffraction in the entire optical system is discussed.
Geis Norbert
Looney Leslie W.
Poglitsch Albrecht
Raab Walfried
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