Hollow-core-fiber delivery of broadband mid-infrared light for remote multi-species spectroscopy

Johnson, Kerr, Castro-Marin, Pablo, Farrell, Carl, Davidson, Ian A., Jasion, Gregory T., Wheeler, Natalie V., Poletti, Francesco, Richardson, David J. and Reid, Derryck T. (2021) Hollow-core-fiber delivery of broadband mid-infrared light for remote multi-species spectroscopy. In 2021 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2021. IEEE.. (doi:10.1109/CLEO/Europe-EQEC52157.2021.9542343).

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 H³⁵Cl and H³⁷Cl 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.

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Contributors

Author: Gregory T. Jasion

Author: Natalie V. Wheeler

Author: Francesco Poletti

Author: David J. Richardson

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