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dc.contributor.authorThomas, Jack W.
dc.contributor.authorPolak, Adam
dc.contributor.authorBonner, Gerald M.
dc.contributor.authorLogie, David
dc.contributor.authorDunn, Malcolm H.
dc.contributor.authorMatthews, Jonathan C.F.
dc.contributor.authorStothard, David J.M.
dc.date.accessioned2020-02-27T12:30:02Z
dc.date.available2020-02-27T12:30:02Z
dc.date.issued2020-02-17
dc.identifier266603911
dc.identifierad82f13f-0528-4966-a17c-549ad3f28c8f
dc.identifier85079356837
dc.identifier000514575500016
dc.identifier.citationThomas , J W , Polak , A , Bonner , G M , Logie , D , Dunn , M H , Matthews , J C F & Stothard , D J M 2020 , ' Widely-tunable mid-infrared ring cavity pump-enhanced OPO and application in photo-thermal interferometric trace ethane detection ' , Optics Express , vol. 28 , no. 4 , pp. 4550-4562 . https://doi.org/10.1364/OE.385603en
dc.identifier.issn1094-4087
dc.identifier.urihttps://hdl.handle.net/10023/19544
dc.descriptionFunding: Innovate UK (133076); Engineering and Physical Sciences Research Council (EP//L01596X/1, EP/M01326X/1, EP/M024385/1); European Research Council (ERC-2018-STG 803665).en
dc.description.abstractThe development of a broadly and accurately tunable single-frequency mid-infrared laser source and its application to a sensitive laser absorption detection method are described. Photo-thermal interferometric spectroscopy is employed as a phase-sensitive method to detect the minute refractive index change caused by the heating of a gas under laser radiation. A separate probe beam allows for the spectrally-interesting mid-infrared region to be examined whilst utilizing low cost, high detectivity photodetectors in the visible/near-infrared region. We also describe the implementation of a Sagnac interferometer to minimize the effects of environmental perturbation and provide inherent passive stability. A continuous-wave ring-cavity pump-enhanced OPO has been developed to provide excitation light from 3–4 µm at 140 mW with the ability to mode-hop tune continuously over 90 cm−1 in 0.07 cm−1 steps. Complementary use of both detection apparatus and excitation source has allowed for presence of ethane to be detected down to 200 parts per billion.developed to provide excitation light from 3–4 µm at 140 mW with the ability to mode-hop tune continuously over 90 cm−1 in 0.07 cm−1 steps. Complementary use of both detection apparatus and excitation source has allowed for presence of ethane to be detected down to 200 parts per billion.
dc.format.extent13
dc.format.extent4437900
dc.language.isoeng
dc.relation.ispartofOptics Expressen
dc.subjectAbsorption coefficienten
dc.subjectCarbon dioxide lasersen
dc.subjectGas lasersen
dc.subjectLaser beamsen
dc.subjectLaser sourcesen
dc.subjectPhase matchingen
dc.subjectQC Physicsen
dc.subjectAtomic and Molecular Physics, and Opticsen
dc.subjectT-NDASen
dc.subject.lccQCen
dc.titleWidely-tunable mid-infrared ring cavity pump-enhanced OPO and application in photo-thermal interferometric trace ethane detectionen
dc.typeJournal articleen
dc.contributor.sponsorEPSRCen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. University of St Andrewsen
dc.identifier.doi10.1364/OE.385603
dc.description.statusPeer revieweden
dc.identifier.grantnumberEP/L01596X/1en


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