Frequency locking of single-mode 3.5-THz quantum cascade lasers using a gas cell
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Hu_Frequency locking.pdf
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Author(s)
Ren, Y.
Hovenier, J. N.
Cui, M.
Hayton, D. J.
Gao, J. R.
Klapwijk, T. M.
Shi, S. C.
Reno, J. L.
Kao, Tsung-Yu
Hu, Qing
Date Issued
January 2012
Journal
Applied Physics Letters
Publisher
American Institute of Physics (AIP)
Citation
Ren, Y., J. N. Hovenier, M. Cui, D. J. Hayton, J. R. Gao, T. M. Klapwijk, S. C. Shi, T.-Y. Kao, Q. Hu, and J. L. Reno. “Frequency Locking of Single-Mode 3.5-THz Quantum Cascade Lasers Using a Gas Cell.” Appl. Phys. Lett. 100, no. 4 (2012): 041111. © 2012 American Institute of Physics
Version
Final published version
Abstract
We report frequency locking of two 3.5-THz third-order distributed feedback (DFB)quantum cascade lasers(QCLs) by using methanol molecular absorption lines, a proportional-integral-derivative controller, and a NbN bolometer. We show that the free-running linewidths of the QCLs are dependent on the electrical and temperature tuning coefficients. For both lasers, the frequency locking induces a similar linewidth reduction factor, whereby the narrowest locked linewidth is below 18 kHz with a Gaussian-like shape. The linewidth reduction factor and the ultimate linewidth correspond to the measured frequency noise power spectral density.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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DOI of Published Version
https://doi.org/10.1063/1.3679620
