Terahertz heterodyne spectrometer using a quantum cascade laser
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Hu_Terahertz heterodyne.pdf
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Author(s)
Ren, Y.
Hovenier, J. N.
Higgins, R.
Gao, J. R.
Klapwijk, T. M.
Shi, S. C.
Bell, A.
Klein, B.
Williams, B. S.
Kumar, S.
Date Issued
October 2010
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, A. Bell, et al. “Terahertz Heterodyne Spectrometer Using a Quantum Cascade Laser.” Appl. Phys. Lett. 97, no. 16 (2010): 161105. © 2010 American Institute of Physics
Version
Final published version
Abstract
A terahertz (THz) heterodyne spectrometer is demonstrated based on a quantum cascade laser(QCL) as a local oscillator (LO) and an NbN hot electron bolometer as a mixer, and it is used to measure high-resolution molecular spectral lines of methanol (CH[subscript 3]OH) between 2.913–2.918 THz. The spectral lines are taken from a gas cell containing methanol gas and using a single-mode QCL at 2.9156 THz as an LO, which is operated in the free running mode. By increasing the pressure of the gas, line broadening and saturation are observed. The measured spectra showed good agreement with a theoretical model.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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DOI of Published Version
https://doi.org/10.1063/1.3502479
