High-resolution heterodyne spectroscopy using a tunable quantum cascade laser around 3.5 THz
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Hu_High-resolution.pdf
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Author(s)
Ren, Y.
Hovenier, J. N.
Higgins, R.
Gao, J. R.
Klapwijk, T. M.
Shi, S. C.
Klein, B.
Reno, J. L.
Kao, Tsung-Yu
Hu, Qing
Date Issued
June 2011
Journal
Applied Physics Letters
Publisher
American Institute of Physics (AIP)
Citation
Ren, Y., J. N. Hovenier, R. Higgins, J. R. Gao, T. M. Klapwijk, S. C. Shi, B. Klein, T.-Y. Kao, Q. Hu, and J. L. Reno. “High-Resolution Heterodyne Spectroscopy Using a Tunable Quantum Cascade Laser Around 3.5 THz.” Appl. Phys. Lett. 98, no. 23 (2011): 231109. © 2011 American Institute of Physics
Version
Final published version
Abstract
A frequency tunable terahertz heterodynespectrometer, based on a third-order distributed feedback quantum cascade laser as a local oscillator, has been demonstrated by measuring molecular spectral lines of methanol (CH[subscript 3]OH) gas at 3.5 THz. By varying the bias voltage of the laser, we achieved a tuning range of ~ 1 GHz of the lasing frequency, within which the molecular spectral lines were recorded. The measured spectra show excellent agreement with modeled ones. By fitting we derived the lasing frequency for each bias voltage accurately. The ultimate performance of the receiver including the resolution of noise temperature and frequency is also addressed.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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DOI of Published Version
https://doi.org/10.1063/1.3599518
