Physics – Optics
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apopt..25..474r&link_type=abstract
Applied Optics (ISSN 0003-6935), vol. 25, Feb. 15, 1986, p. 474-477.
Physics
Optics
2
Imaging Techniques, Infrared Spectrometers, Optical Heterodyning, Astronomical Spectroscopy, Laser Spectroscopy
Scientific paper
Astronomical heterodyne observations at a wavelength of 10 microns have been restricted to one spatial mode. This investigation is concerned with an approach which makes it possible to overcome this restriction. The considered approach is implemented with the aid of an astronomical heterodyne spectrometer. The multiple-beam system employed with the spectrometer consists essentially of a sealed-off carbon dioxide laser, an LN2-cooled CdHgTe photovoltaic detector, and a filter spectrometer for spectral analysis. The photovoltaic detectors are available as arrays containing from four to twelve elements. The results of a statistical analysis provide evidence that the sensitivity of the instrument approaches the quantum noise limit, if unavoidable losses are taken into consideration.
Rothermel Hermann
Schrey U.
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