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Terahertz heterodyne spectrometer using a quantum cascade laser

Ren, Y. and Hovenier, J. N. and Higgins, R. and Gao, J. R. and Klapwijk, T. M. and Shi, S. C. and Bell, A. and Klein, B. and Williams, B. S. and Kumar, S. and Hu, Q. and Reno, J. L. (2010) Terahertz heterodyne spectrometer using a quantum cascade laser. Applied Physics Letters, 97 (16). Art. No. 161105. ISSN 0003-6951. doi:10.1063/1.3502479.

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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_3OH) 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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Additional Information:© 2010 American Institute of Physics Received 18 June 2010; accepted 25 September 2010; published online 19 October 2010. We acknowledge W. Zhang and P. Khosropanah for making the HEB mixer ready for this experiment and A. de Lange for discussions. The work was partly supported by China Exchange Programme executed by KNAW and CAS, and by the AMSTAR+AMSTAR+ project of RadioNet under FP7, and NWO.
Group:Keck Institute for Space Studies
Funding AgencyGrant Number
Koninklijke Nederlandse Akademie van Wetenschappen (KNAW)UNSPECIFIED
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)UNSPECIFIED
Issue or Number:16
Record Number:CaltechAUTHORS:20160311-141238030
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:65309
Deposited By: Colette Connor
Deposited On:11 Mar 2016 22:24
Last Modified:10 Nov 2021 23:43

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