Abstract-Terahertz dual-comb spectroscopy using quantum cascade laser frequency combs

Jonas Westberg, Lukasz A. Sterczewski, Yang Yang, David Burghoff, John Reno, Qing Hu,  Gerard Wysocki,

http://www.etoponline.org/abstract.cfm?uri=CLEO_SI-2018-STu4D.2dua

We demonstrate THz dual comb spectroscopy of molecular samples using dispersion compensated quantum cascade lasers. The system achieves an optical bandwidth of ~150 GHz at 2.9 THz and is used to measure ammonia in gas phase.

© 2018 The Author(s)

Abstract-Absolute-Frequency high-resolution real-time terahertz dual-comb spectrometer

Frederik Walla,  Borja Jerez,  Pedro Martín-Mateos, Cristina de Dios,  Pablo Acedo,

http://ieeexplore.ieee.org/document/8067218/


An absolute-frequency Terahertz dual frequency comb spectrometer for tunable, high-resolution and real-time rapid acquisition is presented. Two combs (probe and local oscillator) are electro-optically generated from the same line of a master optical frequency comb selected by optical injection locking. Photomixing each of these two initial optical combs with a coherent mode from the same master comb generates a narrow-linewidth Terahertz dual comb through difference frequency generation. The resulting dual-comb teeth are absolutely referenced to a RF clock standard.