Stabilized HEB-QCL heterodyne spectrometer at super-terahertz

Y. Ren; D. J. Hayton; J. N. Hovenier; M. Cui; J. R. Gao; T. M. Klapwijk; S. C. Shi; T.-Y. Kao; Q. Hu; J. L. Reno

doi:10.1117/12.925651

24 September 2012 Stabilized HEB-QCL heterodyne spectrometer at super-terahertz

Y. Ren, D. J. Hayton, J. N. Hovenier, M. Cui, J. R. Gao, T. M. Klapwijk, S. C. Shi, T.-Y. Kao, Q. Hu, J. L. Reno

Proceedings Volume 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI; 845210 (2012) https://doi.org/10.1117/12.925651
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

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.

Citation Download Citation

Y. Ren, 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", Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 845210 (24 September 2012); https://doi.org/10.1117/12.925651

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