Scientific Results

Quantum cascade laser based hybrid dual comb spectrometer

Year: 2020

Authors: Consolino L., Nafa M., De Regis M., Garrasi K., Mezzapesa F.P., Li L., Davies A.G., Linfield E.H., Vitiello M.S., Bartalini S., De Natale P.

Autors Affiliation: CNR-Istituto Nazionale di Ottica and LENS, Via N. Carrara 1, 50019 Sesto Fiorentino (FI), Italy; NEST, CNR – Istituto Nanoscienze and Scuola Normale Superiore, Piazza S. Silvestro 12, 56127 Pisa, Italy; School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, UK; ppqSense Srl, Via Gattinella 20, 50013 Campi Bisenzio FI, Italy

Abstract: Four-wave-mixing-based quantum cascade laser frequency combs (QCL-FC) are a powerfulphotonic tool, driving a recent revolution in major molecularfingerprint regions, i.e. mid- andfar-infrared domains. Their compact and frequency-agile design, together with their highoptical power and spectral purity, promise to deliver an all-in-one source for the mostchallenging spectroscopic applications. Here, we demonstrate a metrological-grade hybriddual comb spectrometer, combining the advantages of a THz QCL-FC with the accuracy andabsolute frequency referencing provided by a free-standing, optically-rectified THz frequencycomb. A proof-of-principle application to methanol molecular transitions is presented. Themulti-heterodyne molecular spectra retrieved provide state-of-the-art results in line-centerdetermination, achieving the same precision as currently available molecular databases. Thedevised setup provides a solid platform for a new generation of THz spectrometers, pavingthe way to more refined and sophisticated systems exploiting full phase control of QCL-FCs,or Doppler-free spectroscopic schemes.

Journal/Review: COMMUNICATIONS PHYSICS

Volume: 3 (1)      Pages from: 69-1  to: 69-9

KeyWords: Metrology, Terahertz spectroscopy, Comb spectroscopy, Dual-Comb spectroscopy, Spectroscopy, Lasers, Quantum Cascade Lasers, Optics
DOI: 10.1038/s42005-020-0344-0

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