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A Terahertz VRT spectrometer employing quantum cascade lasers

et al.

Published Web Location

https://doi.org/10.1016/j.cplett.2015.08.027
Abstract

The first application of a commercial Terahertz quantum cascade laser (QCL) system for high resolution spectroscopy of supersonic beams is presented. The QCLs exhibited continuous linear voltage tuning over a 2GHz range about a center frequency of 3.762THz with ∼1ppm resolution. A sensitivity of ∼1ppm fractional absorption was measured with a single pass optical system. Multipass operation at the quantum noise limit of the stressed photoconductor detector would produce a 100-fold improvement.

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