Hollow-Core-Fiber Delivery of Broadband Mid-Infrared Light for Remote Multi-Species Spectroscopy

Kerr Johnson, Pablo Castro-Marín, Carl Farrell, Ian A. Davidson, Gregory T. Jasion, Natalie V. Wheeler, Francesco Poletti, David J. Richardson, Derryck T. Reid

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Mid-infrared (mid-IR) light provides a means to identify molecules using ro-vibrational spectroscopy. Where measurement is required in a remote or hazardous environment, fibre delivery is convenient, but is limited by the scalability of fluoride and chalcogenide fibres to only a few meters in length. Low-loss mid-IR hollow-core fibres (HCFs) have been reported [1] , [2] , with losses at 3.1m of 18 dB km -1 [3]. Here, we report fibre-delivered multi-species mid-IR spectroscopy, with broadband 2850-3150 cm -1 light routed to a remote gas cell via HCF. By using Fourier-transform spectroscopy we achieve resolutions of 0.05 cm -1 and in-fibre concentration measurements of contaminants H 35 Cl and H 37 Cl with 5-ppb precision. High-resolution multi-species fitting is used to mitigate spectroscopic interference between species, enabling spectroscopy in a gas cell after the fibre.

Original languageEnglish
Title of host publication2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
PublisherIEEE
ISBN (Electronic)9781665418768
DOIs
Publication statusPublished - 30 Sep 2021
Event2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference - Munich, Germany
Duration: 21 Jun 202125 Jun 2021

Conference

Conference2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference
Abbreviated titleCLEO/Europe-EQEC 2021
Country/TerritoryGermany
CityMunich
Period21/06/2125/06/21

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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