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Terahertz heterodyne spectrometer using a quantum cascade laser

  • A terahertz (THz) heterodynespectrometer 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 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 measuredspectra showed good agreement with a theoretical model.

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Document Type:Article
Author:Y. Ren, J. N. Hovenier, R. Higgins, J. R. Gao, T. M. Klapwijk, S. C. Shi, A. Bell, B. Klein, B. S. Williams, S. Kumar, Q. Hu, J. L. Reno
Parent Title (English):Appl. Phys. Lett. (Applied Physics Letters)
First Page:161105
Publisher:AIP Publishing
Date of first publication:2010/10/19
Tag:Radio-frequency; bolometers; hot carriers; magnetic resonance spectrometers auxiliary equipment; microwave spectra; organic compounds; quantum cascade lasers; radiowave spectrometers; spectral line broadening; submillimeter wave microwave; techniques; terahertz spectroscopy; terahertz wave spectra
Departments, institutes and facilities:Fachbereich Elektrotechnik, Maschinenbau, Technikjournalismus
Dewey Decimal Classification (DDC):5 Naturwissenschaften und Mathematik / 52 Astronomie / 520 Astronomie und zugeordnete Wissenschaften
Entry in this database:2015/10/09