Stabilized HEB-QCL heterodyne spectrometer at super-terahertz

Author(s)
Ren, Y.; Hayton, D. J.; Hovenier, J. N.; Cui, M.; Gao, J. R.; ... Show more
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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.© (2012) SPIE.
Date issued
2012-09
URI
http://hdl.handle.net/1721.1/86384
Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Research Laboratory of Electronics
Journal
Proceedings of SPIE--the International Society for Optical Engineering
Publisher
SPIE
Citation
Ren, Y., D. J. Hayton, J. N. Hovenier, M. Cui, J. R. Gao, T. M. Klapwijk, S. C. Shi, T.-Y. Kao, Q. Hu, and J. L. Reno. “Stabilized HEB-QCL Heterodyne Spectrometer at Super-Terahertz.” Edited by Wayne S. Holland. Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI (September 24, 2012). (Proc. SPIE 8452).
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