Abstract
We have developed a new liquid-helium cooled far-infrared Fabry-Perot interferometer (SFP) with high spectral resolution which will be incorporated and flown with our balloon-borne far-infrared 60 cm φ telescope FIT-FIT. This telescope has been built and already flown with other radiometric equipment in collaboration with the Geneva Observatory. The new spectrometer is designed to measure astronomical emission lines between 140 and 220 μm wavelength. Of special interest are the [NII]-line at 205 μm as well as the [CII]-line at 158 μm. In order to achieve high sensitivity we had to minimize the thermal radiation from the interferometer and its optics. For this reason all optics, including the scanning Fabry-Perot interferometer SFP, are liquid-helium cooled. This paper describes special new features of the design, operation, and test of its performance at liquid-helium temperature with optically pumped far-infrared gas lasers.
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