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A Terahertz VRT spectrometer employing quantum cascade lasers

  • Author(s): Cole, WTS;
  • Lee, AWM;
  • Kao, TY;
  • Hu, Q;
  • Reno, JL;
  • Saykally, RJ;
  • Hlavacek, NC
  • et al.
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 2 GHz range about a center frequency of 3.762 THz with ∼1 ppm resolution. A sensitivity of ∼1 ppm 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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