Dual-cavity dual-comb interferometric spectroscopy with incoherent light: Optics and Laser Technology

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dc.contributor.authorBraal, J.
dc.contributor.authorChandran, S.
dc.contributor.authorSheehan, R.
dc.contributor.authorWalsh, A.J.
dc.contributor.authorRuth, A.A.
dc.contributor.funderTaighde Éireann - Research Ireland
dc.contributor.funderIrish Research Council, GOIPG/2021/1263-21/PATH-S/9430
dc.contributor.funderECDL
dc.date.accessioned2026-06-08T12:00:02Z
dc.date.available2026-06-08T12:00:02Z
dc.date.issued2026-05-01
dc.description.abstractWe show that high-resolution cavity-enhanced dual comb absorption spectroscopy can be performed by creating beat spectra with light transmitted by two high finesse optical cavities of similar lengths, which were neither actively stabilized nor locked to the excitation wavelengths. The incoherent light from a superluminescent light emitting diode (∼1535–1560 nm) was spectrally narrowed through filtering (∼50 GHz), amplified, and subsequently coupled into two quasi-confocal optical cavities. The light leaking from the two cavities contains all frequencies that belong to the cavities’ mode structures, which in the case of confocal cavity geometries resembles in essence a frequency comb. When overlapped and detected as a function of time an interferogram is observed whose Fourier transform yields a regular beat spectrum. The frequencies in the beat spectrum are determined by the difference of the free spectral ranges of the two cavities. The average free spectral range of the cavities determines the spectral resolution of this dual-cavity dual-comb interferometric method. The absolute frequency calibration can either be done through the known position of a target species absorption feature or by beating the comb with an appropriate single mode laser frequency. We demonstrate this approach through measurements of spectra of C 2H 2, CO 2 and H 2O and discuss its applicability, advantages, and limitations.en
dc.description.sponsorshipJ. Braal thanks the Irish Research Council for a governmental postgraduate fellowship. S. Chandran and A. Walsh were also supported through Research Ireland's Pathway Programme (21/PATH-S/9430). The authors thank Steve DePuis for the construction of an enclosure for the optical setup, Prince Anandarajah for advice on building an appropriate light source, Frank Peters for the loan of an ECDL and other equipment, and Steve Hegarty for discussions on the data analysis. This work was supported through a Research Ireland’s Frontiers for the Future Award (21/FFP-A/8973) and the Irish Research Council (GOIPG/2021/1263).
dc.description.versionPublished Version
dc.format.extent11
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid115393
dc.identifier.authororcidBraal, J.
dc.identifier.authororcidChandran, S.
dc.identifier.authororcidSheehan, R.§0000-0003-1420-9764
dc.identifier.authororcidWalsh, A.J.
dc.identifier.authororcidRuth, A.A.§0000-0001-5935-5170
dc.identifier.citationBraal, J, Chandran, S, Sheehan, R, Walsh, A J & Ruth, A A 2026, 'Dual-cavity dual-comb interferometric spectroscopy with incoherent light : Optics and Laser Technology', Opt Laser Technol, vol. 202, 115393. https://doi.org/10.1016/j.optlastec.2026.115393
dc.identifier.doi10.1016/j.optlastec.2026.115393
dc.identifier.issn0030-3992
dc.identifier.journaltitleOpt Laser Technol
dc.identifier.otherRIS: urn:12CDC1E3F752B29480526F582EDA9B38
dc.identifier.otherORCID: /0000-0003-1420-9764/work/217137542
dc.identifier.urihttps://hdl.handle.net/10468/18951
dc.identifier.volume202
dc.language.isoen
dc.publisherElsevier Ltd
dc.relation.urihttps://www.scopus.com/pages/publications/105037463913
dc.relation.urihttps://www.scopus.com/pages/publications/105037463913?origin=resultslist
dc.rights© 2026, the Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/ )
dc.rights.accessrightsopen access
dc.rights.licensenameAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.statusPeer reviewed
dc.subjectAtmospheric science
dc.subjectBroadband
dc.subjectCavity-enhanced absorption spectroscopy
dc.subjectDual-comb interferometry
dc.subjectIncoherent light
dc.subjectTrace gas detection
dc.subjectChemical detection
dc.subjectInterferometry
dc.subjectLight absorption
dc.subjectSpectral resolution
dc.subjectTrace analysis
dc.subjectCavity enhanced absorption spectroscopy
dc.subjectDual cavity
dc.subjectFree spectral range
dc.subjectSpectra's
dc.subjectTwo-cavity
dc.subjectAbsorption spectroscopy
dc.subject[Physics]
dc.titleDual-cavity dual-comb interferometric spectroscopy with incoherent light: Optics and Laser Technologyen
dc.typeArticle (peer-reviewed)
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