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High-resolution heterodyne spectroscopy using a tunable quantum cascade laser around 3.5 THz

  • 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 (CH3OH) 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.

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Document Type:Article
Author:Y. Ren, J. N. Hovenier, R. Higgins, J. R. Gao, T. M. Klapwijk, S. C. Shi, B. Klein, T.-Y. Kao, Q. Hu, J. L. Reno
Parent Title (English):Appl. Phys. Lett. (Applied Physics Letters)
First Page:231109
Publisher:AIP Publishing
Date of first publication:2011/06/09
Tag:Metrological applications; Radio-frequency; magnetic resonance spectrometers auxiliary equipment; measurement by laser beam; microwave spectra; optical frequency synthesizers for precision spectroscopy; quantum cascade lasers; radiowave spectrometers; spectrochemical analysis; submillimeter wave microwave; techniques; terahertz spectroscopy
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