{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T01:06:54Z","timestamp":1788916014908,"version":"build-2803163510"},"reference-count":55,"publisher":"Optica Publishing Group","issue":"8","license":[{"start":{"date-parts":[[2024,4,4]],"date-time":"2024-04-04T00:00:00Z","timestamp":1712188800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/doi.org\/10.1364\/OA_License_v2#VOR-OA"},{"start":{"date-parts":[[2024,4,4]],"date-time":"2024-04-04T00:00:00Z","timestamp":1712188800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/opg.optica.org\/policies\/opg-tdm-policy.json"}],"funder":[{"DOI":"10.13039\/100010667","name":"H2020 Industrial Leadership","doi-asserted-by":"publisher","award":["101015825"],"award-info":[{"award-number":["101015825"]}],"id":[{"id":"10.13039\/100010667","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100010667","name":"H2020 Industrial Leadership","doi-asserted-by":"publisher","award":["TRIAGE Project"],"award-info":[{"award-number":["TRIAGE Project"]}],"id":[{"id":"10.13039\/100010667","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003246","name":"Nederlandse Organisatie voor Wetenschappelijk Onderzoek","doi-asserted-by":"publisher","award":["016.Vidi.189.050"],"award-info":[{"award-number":["016.Vidi.189.050"]}],"id":[{"id":"10.13039\/501100003246","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["opg.optica.org"],"crossmark-restriction":false},"short-container-title":["Opt. Express"],"published-print":{"date-parts":[[2024,4,8]]},"abstract":"<jats:p>\n                    Supercontinuum sources based on intrapulse difference frequency generation (IDFG) from mode-locked lasers open new opportunities in mid-infrared gas spectroscopy. These sources provide high power and ultra-broadband spectral coverage in the molecular fingerprint region with very low relative intensity noise. Here, we demonstrate the performance of such a light source in combination with a multipass cell and a custom-built Fourier transform spectrometer (FTS) for multispecies trace gas detection. The light source provides a low-noise, ultra-broad spectrum from 2\u201311.5 \u00b5m with \u223c3 W output power, outperforming existing mid-infrared supercontinuum sources in terms of noise, spectral coverage, and output power. This translates to an excellent match for spectroscopic applications, establishing (sub-)ppb sensitivity for molecular hydrocarbons (e.g., CH\n                    <jats:sub>4<\/jats:sub>\n                    , C\n                    <jats:sub>2<\/jats:sub>\n                    H\n                    <jats:sub>4<\/jats:sub>\n                    ), oxides (e.g., SO\n                    <jats:sub>2<\/jats:sub>\n                    , NO\n                    <jats:sub>x<\/jats:sub>\n                    ), and small organic molecules (e.g., acetone, ethyl acetate) over the spectral range of the supercontinuum source with a measurement time varying from seconds to minutes. We demonstrate a practical application by measuring the off-gas composition of a bioreactor containing an acidic ammonia-oxidizing culture with the simultaneous detection of multiple nitrogen oxides (NO, NO\n                    <jats:sub>2<\/jats:sub>\n                    , N\n                    <jats:sub>2<\/jats:sub>\n                    O, etc.). As the different species absorb various parts of the spectrum, these results highlight the functionality of this spectroscopic system for biological and environmental applications.\n                  <\/jats:p>","DOI":"10.1364\/oe.515914","type":"journal-article","created":{"date-parts":[[2024,2,12]],"date-time":"2024-02-12T11:00:26Z","timestamp":1707735626000},"page":"14506","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Ultra-broadband spectroscopy using a 2\u201311.5 \u00b5m IDFG-based supercontinuum source"],"prefix":"10.1364","volume":"32","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8016-3309","authenticated-orcid":true,"given":"Roderik","family":"Krebbers","sequence":"first","affiliation":[{"name":"Radboud University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0000-4045-1410","authenticated-orcid":true,"given":"Kees","family":"van Kempen","sequence":"additional","affiliation":[{"name":"Radboud University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Frans J. M.","family":"Harren","sequence":"additional","affiliation":[{"name":"Radboud University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2520-3547","authenticated-orcid":true,"given":"Sergey","family":"Vasilyev","sequence":"additional","affiliation":[{"name":"IPG Photonics Corporation"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ida F.","family":"Peterse","sequence":"additional","affiliation":[{"name":"Radboud University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sebastian","family":"L\u00fccker","sequence":"additional","affiliation":[{"name":"Radboud University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0212-7617","authenticated-orcid":true,"given":"Amir","family":"Khodabakhsh","sequence":"additional","affiliation":[{"name":"Radboud University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Simona M.","family":"Cristescu","sequence":"additional","affiliation":[{"name":"Radboud University"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2024,4,4]]},"reference":[{"key":"oe-32-8-14506-R1","doi-asserted-by":"publisher","first-page":"182","DOI":"10.1016\/j.infrared.2018.04.008","volume":"91","author":"Petersen","year":"2018","journal-title":"Infrared Phys. 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