Frequency and amplitude stabilized terahertz quantum cascade laser as local oscillator
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Hu_Frequency and amplitude.pdf
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Author(s)
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.
Date Issued
September 2012
Journal
Applied Physics Letters
Publisher
American Institute of Physics
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. “Frequency and Amplitude Stabilized Terahertz Quantum Cascade Laser as Local Oscillator.” Appl. Phys. Lett. 101, no. 10 (2012): 101111. © 2012 AIP.
Version
Final published version
Abstract
We demonstrate an experimental scheme to simultaneously stabilize the frequency and amplitude of a 3.5 THz third-order distributed feedback quantum cascade laser as a local oscillator. The frequency stabilization has been realized using a methanol absorption line, a power detector, and a proportional-integral-derivative (PID) loop. The amplitude stabilization of the incident power has been achieved using a swing-arm voice coil actuator as a fast optical attenuator, using the direct detection output of a superconducting mixer in combination with a 2nd PID loop. Improved Allan variance times of the entire receiver, as well as the heterodyne molecular spectra, are demonstrated.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Research Laboratory of Electronics
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DOI of Published Version
https://doi.org/10.1063/1.4751247
