Terahertz heterodyne spectrometer using a quantum cascade laser

Terahertz heterodyne spectrometer using a quantum cascade laser

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 spe...

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Bibliographic Details
Main Authors: 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., Reno, J. L., Hu, Qing
Other Authors: Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Format: Article
Language:en_US
Published: American Institute of Physics (AIP) 2014
Online Access:http://hdl.handle.net/1721.1/86345
https://orcid.org/0000-0003-1982-4053
Description
Summary: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.

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