Dual-feedback mid-infrared cavity-enhanced absorption spectroscopy for H2CO detection using a radio-frequency electrically-modulated interband cascade laser

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dc.citation.firstpage15436en_US
dc.citation.issueNumber12en_US
dc.citation.journalTitleOptics Expressen_US
dc.citation.lastpage15444en_US
dc.citation.volumeNumber26en_US
dc.contributor.authorHe, Qixinen_US
dc.contributor.authorZheng, Chuantaoen_US
dc.contributor.authorLou, Minhanen_US
dc.contributor.authorYe, Weilinen_US
dc.contributor.authorWang, Yidingen_US
dc.contributor.authorTittel, Frank K.en_US
dc.date.accessioned2018-09-26T14:52:41Zen_US
dc.date.available2018-09-26T14:52:41Zen_US
dc.date.issued2018en_US
dc.description.abstractA mid-infrared cavity-enhanced sensor system was demonstrated for the detection of formaldehyde (H2CO) using a continuous-wave (cw) interband cascade laser (ICL) centered at 3599 nm. A compact Fabry-Perot (F-P) cavity with a physical size of 38 × 52 × 76 mm3 was developed consisting of two concave mirrors with a radius of curvature of 80 mm and a reflectivity of 99.8% at 3.6 μm. Different from the widely reported electro-optical (EO) external modulation based Pound-Drever-Hall (PDH) locking technique, a radio-frequency electrical internal modulation based PDH technique was used for locking the laser mode to the cavity mode. A dual-feedback control on the laser current and on the piezo transducer (PZT) displacement was utilized for further stabilizing mode locking. A 20 m effective optical path length was achieved with a cavity length of 2 cm and a finesse of 1572. The effectiveness and sensitivity of the sensor system were demonstrated by targeting an absorption line at 2778.5 cm−1 for H2CO measurements. A linear relation between the cavity transmitted signal amplitude and the H2CO concentration was obtained within the range of 0−5 ppm. A 1σ detection limit of 25 parts-per-billion (ppb) was achieved with an averaging time of 1 s based on Allan-Werle variance analysis. The reported dual-feedback RF modulation based PDH technique led to a method for gas detection using a similar experimental setup and measurement scheme.en_US
dc.identifier.citationHe, Qixin, Zheng, Chuantao, Lou, Minhan, et al.. "Dual-feedback mid-infrared cavity-enhanced absorption spectroscopy for H2CO detection using a radio-frequency electrically-modulated interband cascade laser." <i>Optics Express,</i> 26, no. 12 (2018) The Optical Society: 15436-15444. https://doi.org/10.1364/OE.26.015436.en_US
dc.identifier.digitaloe-26-12-15436en_US
dc.identifier.doihttps://doi.org/10.1364/OE.26.015436en_US
dc.identifier.urihttps://hdl.handle.net/1911/102711en_US
dc.language.isoengen_US
dc.publisherThe Optical Societyen_US
dc.rightsAuthors and readers may use, reuse, and build upon the article, or use it for text or data mining without asking prior permission from the publisher or the Author(s), as long as the purpose is non-commercial and appropriate attribution is maintained.en_US
dc.rights.urihttps://www.osapublishing.org/library/license_v1.cfm#VOR-OAen_US
dc.titleDual-feedback mid-infrared cavity-enhanced absorption spectroscopy for H2CO detection using a radio-frequency electrically-modulated interband cascade laseren_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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