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Published October 18, 2010 | Published
Journal Article Open

Terahertz heterodyne spectrometer using a quantum cascade laser

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_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.

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.

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Created:
August 19, 2023
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October 18, 2023