Quantum cascade laser based hybrid dual comb spectrometer
Description
<jats:title>Abstract</jats:title><jats:p>Four-wave-mixing-based quantum cascade laser frequency combs (QCL-FC) are a powerful photonic tool, driving a recent revolution in major molecular fingerprint regions, i.e. mid- and far-infrared domains. Their compact and frequency-agile design, together with their high optical power and spectral purity, promise to deliver an all-in-one source for the most challenging spectroscopic applications. Here, we demonstrate a metrological-grade hybrid dual comb spectrometer, combining the advantages of a THz QCL-FC with the accuracy and absolute frequency referencing provided by a free-standing, optically-rectified THz frequency comb. A proof-of-principle application to methanol molecular transitions is presented. The multi-heterodyne molecular spectra retrieved provide state-of-the-art results in line-center determination, achieving the same precision as currently available molecular databases. The devised setup provides a solid platform for a new generation of THz spectrometers, paving the way to more refined and sophisticated systems exploiting full phase control of QCL-FCs, or Doppler-free spectroscopic schemes.</jats:p>
Journal
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- Communications Physics
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Communications Physics 3 (1), 69-, 2020-04-24
Springer Science and Business Media LLC
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Details 詳細情報について
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- CRID
- 1360580238890257792
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- ISSN
- 23993650
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- Data Source
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- Crossref