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Proceedings Paper

Stabilized HEB-QCL heterodyne spectrometer at super-terahertz
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Paper Abstract

We report a new experiment on a high-resolution heterodyne spectrometer using a 3.5 THz quantum cascade laser (QCL) as local oscillator (LO) and a superconducting hot electron bolometer (HEB) as mixer by stabilizing both frequency and amplitude of the QCL. The frequency locking of the QCL is demonstrated by using a methanol molecular absorption line, a proportional-integral-derivative (PID) controller, and a direct power detector. We show that the LO locked linewidth can be as narrow as 35 KHz. The LO power to the HEB is also stabilized by means of swing-arm actuator placed in the beam path in combination of a second PID controller.

Paper Details

Date Published: 24 September 2012
PDF: 6 pages
Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 845210 (24 September 2012); doi: 10.1117/12.925651
Show Author Affiliations
Y. Ren, Delft Univ. of Technology (Netherlands)
Purple Mountain Observatory (China)
Chinese Academy of Sciences (China)
D. J. Hayton, SRON Netherlands Institute for Space Research (Netherlands)
J. N. Hovenier, Delft Univ. of Technology (Netherlands)
M. Cui, SRON Netherlands Institute for Space Research (Netherlands)
J. R. Gao, Delft Univ. of Technology (Netherlands)
SRON Netherlands Institute for Space Research (Netherlands)
T. M. Klapwijk, Delft Univ. of Technology (Netherlands)
S. C. Shi, Purple Mountain Observatory (China)
T.-Y. Kao, Massachusetts Institute of Technology (United States)
Q. Hu, Massachusetts Institute of Technology (United States)
J. L. Reno, Sandia National Labs. (United States)


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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