Cryogenic operation of submillimeter quasioptical mixers |
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| Authors: | P F Goldsmith H R Fetterman B J Clifton C D Parker and N R Erickson |
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| Institution: | (1) Five College Radio Astronomy Observatory, University of Massachusetts, 01003 Amherst, MA;(2) MIT Lincoln Laboratory, 02173 Lexington, MA |
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| Abstract: | We report here the first results obtained by cooling a submillimeter quasioptical mixer, utilizing a Schottky diode in a corner reflector mixer structure. Measurements have been carried out at a wavelength of 434 microns. The diode inverse slope parameter Vo at low current decreases by a factor of 3 upon cooling to 50 K while the minimum system noise temperature of 5600 K (SSB), including the IF contribution, demonstrates a reduction of approximately 40% from the ambient temperature value. We also report improved system noise temperatures at 184  m and 119 m wavelengths of 38000 K and 64000 K (SSB), respectively.This work was supported by the Army Research Office and the Air Force Office of Scientific Research |
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| Keywords: | submillimeter heterodyne systems Schottky barrier mixers cryogenic cooling |
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