Physics – Optics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984abas.symp..320b&link_type=abstract
In NASA. Ames Research Center Airborne Astron. Symp. p 320-329 (SEE N85-17848 08-89)
Physics
Optics
14
Airborne Equipment, Optical Heterodyning, Radio Astronomy, Spectrometers, Telescopes, Amplifiers, C-135 Aircraft, Cassegrain Optics, Diplexers, Laser Applications, Oscillators
Scientific paper
The advantages of heterodyne detection for high resolution spectroscopy were long known to radio astronomers. Heterodyne spectroscopy was productive at submillimeter wavelengths, but its extension to shorter submillimeter and far-infrared (FIR) wavelengths was hampered by inadequate mixers and local oscillators. A significant advance in FIR receiver technology was demonstrated using an optically-pumped FIR laser and a Schottky-diode mixer. Any similar spectrometer intended for airborne observations at shorter wavelengths must be compatible with the more restrictive aircraft environment. The effectiveness of the design of a FIR heterodyne spectrometer was verified in ground-based observations with a prototype version. The airborne successor is even more compact, and has a much broader spectral coverage. Flight tests are scheduled for the new instrument.
Betz Amy
Zmuidzinas Jonas S.
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