Quantum cascade laser based hybrid dual comb spectrometer

Year: 2020

Authors: Consolino L., Nafa M., De Regis M., Cappelli F., Garrasi K., Mezzapesa FP., Li LH., Davies AG., Linfield EH., Vitiello MS., Bartalini S., De Natale P.

Autors Affiliation: CNR, Ist Nazl Ott, Via N Carrara 1, I-50019 Sesto Fiorentino, FI, Italy; LENS, Via N Carrara 1, I-50019 Sesto Fiorentino, FI, Italy; CNR, NEST, Ist Nanosci, Piazza S Silvestro 12, I-56127 Pisa, Italy; Scuola Normale Super Pisa, Piazza S Silvestro 12, I-56127 Pisa, Italy; Univ Leeds, Sch Elect & Elect Engn, Leeds LS2 9JT, W Yorkshire, England; PpqSense Srl, Via Gattinella 20, I-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

More Information: The authors acknowledge financial support from the Qombs Project, EU-H2020-FET Flagship on Quantum Technologies grant no. 820419, the ERC Project 681379 (SPRINT), the EC Project 665158 (ULTRAQCL), the Italian ESFRI Roadmap (Extreme Light Infrastructure-ELI), EC-H2020 Laserlab-Europe grant agreement 654148, EPSRC (HyperTerahertz programme, EP/P021859/1). E.H.L. acknowledges support from the Royal Society and Qombs Project, EU-H2020-FET Flagship on Quantum Technologies grant no. 820419.
KeyWords: Metrology, Terahertz spectroscopy, Comb spectroscopy, Dual-Comb spectroscopy, Spectroscopy, Lasers, Quantum Cascade Lasers, Optics
DOI: 10.1038/s42005-020-0344-0

Citations: 35
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