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Proceedings Paper

Active local oscillator power stabilization for a hot electron bolometer heterodyne receiver
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Paper Abstract

We report on the application of a new technique for actively stabilizing the power of a far infrared gas laser as the local oscillator (LO) in a superconducting hot electron bolometer (HEB) heterodyne receiver system at 2.5 THz. The technique utilizes PID feedback control of the local oscillator intensity by means of a voice-coil based swing arm actuator placed in the beam path. The HEB itself is used as a direct detector to measure incident LO power whilst simultaneously continuing to function as heterodyne mixer. Results presented here demonstrate a factor of 50 improvement in the measured total power and spectroscopic Allan variance time. Allan times of 30 seconds and 25 seconds respectively are shown for large and small area HEB's with a measured effective noise fluctuation bandwidth of 12 MHz. The technique is versatile and can be applied to any LO source and at any LO frequency.

Paper Details

Date Published: 24 September 2012
PDF: 9 pages
Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 84520Z (24 September 2012); doi: 10.1117/12.925851
Show Author Affiliations
D. J. Hayton, SRON Netherlands Institute for Space Research (Netherlands)
J. R. Gao, SRON Netherlands Institute for Space Research (Netherlands)
Delft Univ. of Technology (Netherlands)
J. W. Kooi, California Institute of Technology (United States)
Y. Ren, Delft Univ. of Technology (Netherlands)
Purple Mountain Observatory (China)
W. Zhang, Purple Mountain Observatory (China)
G. de Lange, SRON Netherlands Institute for Space Research (Netherlands)


Published in SPIE Proceedings Vol. 8452:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI
Wayne S. Holland, Editor(s)

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