Terahertz heterodyne spectrometer using a quantum cascade laser

Author(s)
Ren, Y.; Hovenier, J. N.; Higgins, R.; Gao, J. R.; Klapwijk, T. M.; ... Show more
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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.
Date issued
2010-10
URI
http://hdl.handle.net/1721.1/86345
Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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
ISSN
00036951
1077-3118
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