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

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

High-resolution multi-species spectroscopy is achieved by delivering broadband 3-4-μm mid-infrared light through a 4.5-meter-long silica-based hollow-core optical fiber. Absorptions from H37Cl, H35Cl, H2O and CH4 present in the gas within the fiber core are observed, and the corresponding gas concentrations are obtained to 5-ppb precision using a highresolution Fourier-transform spectrometer and a full-spectrum multi-species fitting algorithm. We show that by fully fitting the narrow absorption features of these light molecules their contributions can be nulled, enabling further spectroscopy of C3H6O and C3H8O contained in a Herriott cell after the fiber. As a demonstration of the potential to extend fiber-delivered broadband mid-infrared spectroscopy to significant distances, we present a high-resolution characterization of the transmission of a 63-meter length of hollow-core fiber, fully fitting the input and output spectra to obtain the intra-fiber gas concentrations. We show that, despite the fiber not having been purged, useful spectroscopic windows are still preserved which have the potential to enable hydrocarbon spectroscopy at the distal end of fibers with lengths of tens or even hundreds of meters.

1094-4087
7044-7052
Johnson, Kerr
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Castro-Marin, Pablo
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Farrell, Carl
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Davidson, Ian A.
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Fu, Qiang
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Jasion, Gregory T.
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Wheeler, Natalie V.
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Poletti, Francesco
9adcef99-5558-4644-96d7-ce24b5897491
Richardson, David J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Reid, Derryck T.
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Johnson, Kerr
3749f9fb-c58b-4c64-9566-5bf043aa7f3c
Castro-Marin, Pablo
04c61dc6-ac95-48fc-83fb-97262a15c3e7
Farrell, Carl
81a24aca-6b9a-44c7-a180-52a4af46f36d
Davidson, Ian A.
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Fu, Qiang
b01fb880-ccd2-4acb-8d08-0a9668bed6e6
Jasion, Gregory T.
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Wheeler, Natalie V.
0fd34178-a77b-4c71-a3a6-86a1f634f1a0
Poletti, Francesco
9adcef99-5558-4644-96d7-ce24b5897491
Richardson, David J.
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Reid, Derryck T.
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Johnson, Kerr, Castro-Marin, Pablo, Farrell, Carl, Davidson, Ian A., Fu, Qiang, Jasion, Gregory T., Wheeler, Natalie V., Poletti, Francesco, Richardson, David J. and Reid, Derryck T. (2022) Hollow-core fiber delivery of broadband mid-infrared light for remote spectroscopy. Optics Express, 30 (5), 7044-7052. (doi:10.1364/OE.450413).

Record type: Article

Abstract

High-resolution multi-species spectroscopy is achieved by delivering broadband 3-4-μm mid-infrared light through a 4.5-meter-long silica-based hollow-core optical fiber. Absorptions from H37Cl, H35Cl, H2O and CH4 present in the gas within the fiber core are observed, and the corresponding gas concentrations are obtained to 5-ppb precision using a highresolution Fourier-transform spectrometer and a full-spectrum multi-species fitting algorithm. We show that by fully fitting the narrow absorption features of these light molecules their contributions can be nulled, enabling further spectroscopy of C3H6O and C3H8O contained in a Herriott cell after the fiber. As a demonstration of the potential to extend fiber-delivered broadband mid-infrared spectroscopy to significant distances, we present a high-resolution characterization of the transmission of a 63-meter length of hollow-core fiber, fully fitting the input and output spectra to obtain the intra-fiber gas concentrations. We show that, despite the fiber not having been purged, useful spectroscopic windows are still preserved which have the potential to enable hydrocarbon spectroscopy at the distal end of fibers with lengths of tens or even hundreds of meters.

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More information

Accepted/In Press date: 19 January 2022
e-pub ahead of print date: 16 February 2022
Published date: 28 February 2022
Additional Information: Funding Information: Royal Academy of Engineering; Royal Society; Engineering and Physical Sciences Research Council (EP/P030181/1); Science and Technology Facilities Council (ST/T000635/1). Publisher Copyright: © 2022.

Identifiers

Local EPrints ID: 471084
URI: http://eprints.soton.ac.uk/id/eprint/471084
ISSN: 1094-4087
PURE UUID: 060645a4-5057-4219-8d94-eabe74a730fb
ORCID for Gregory T. Jasion: ORCID iD orcid.org/0000-0001-5030-6479
ORCID for Natalie V. Wheeler: ORCID iD orcid.org/0000-0002-1265-9510
ORCID for Francesco Poletti: ORCID iD orcid.org/0000-0002-1000-3083
ORCID for David J. Richardson: ORCID iD orcid.org/0000-0002-7751-1058

Catalogue record

Date deposited: 25 Oct 2022 16:42
Last modified: 17 Mar 2024 03:24

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Contributors

Author: Kerr Johnson
Author: Pablo Castro-Marin
Author: Carl Farrell
Author: Ian A. Davidson
Author: Qiang Fu
Author: Derryck T. Reid

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