Stabilized HEB-QCL heterodyne spectrometer at super-terahertz

Stabilized HEB-QCL heterodyne spectrometer at super-terahertz

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 demonst...

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Bibliographic Details
Main Authors: Ren, Y., Hayton, D. J., Hovenier, J. N., Cui, M., Gao, J. R., Klapwijk, T. M., Shi, S. C., Kao, Tsung-Yu, Hu, Q., Reno, J. L.
Other Authors: Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Format: Article
Language:en_US
Published: SPIE 2014
Online Access:http://hdl.handle.net/1721.1/86384
Description
Summary: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.

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