Broadband photoacoustic spectroscopy of 14CH4 with a high-power mid-infrared optical frequency comb

Juho Karhu; Teemu Tomberg; Francisco Senna Vieira; Guillaume Genoud; Vesa Hänninen; Markku Vainio; Markus Metsälä; Tuomas Hieta; Steven Bell; Lauri Halonen

doi:10.1364/OL.44.001142

Broadband photoacoustic spectroscopy of ¹⁴CH₄ with a high-power mid-infrared optical frequency comb

Juho Karhu
, Teemu Tomberg
, Francisco Senna Vieira
, Guillaume Genoud
, Vesa Hänninen
, Markku Vainio
, Markus Metsälä
, Tuomas Hieta
, Steven Bell
, Lauri Halonen^*

^*Corresponding author for this work

University of Helsinki
Umeå University
Tampere University
Gasera Oy
National Physics Laboratory (NPL)

Research output: Contribution to journal › Article › Scientific › peer-review

41 Citations (Scopus)

Abstract

We report a photoacoustic spectroscopy setup with a high-power mid-infrared frequency comb as the light source. The setup is used in broadband spectroscopy of radiocarbon methane. Owing to the high sensitivity of a cantilever-enhanced photoacoustic cell and the high-power light source, we can reach a detection limit below 100 ppb in a broadband measurement with a sample volume of only a few milliliters. The first infrared spectrum of ¹⁴CH₄ is reported and given a preliminary assignment. The results lay a foundation for the development of optical detection systems for radiocarbon methane.

Original language	English
Pages (from-to)	1142-1145
Journal	Optics Letters
Volume	44
Issue number	5
DOIs	https://doi.org/10.1364/OL.44.001142
Publication status	Published - 1 Mar 2019
MoE publication type	A1 Journal article-refereed

Funding

Helsingin Yliopisto; Jenny ja Antti Wihurin Rahasto; Academy of Finland (294752, 314363); European Association of National Metrology Institutes (EURAMET) (ENG54) European Metrology Research Programme (EMRP) “Metrology for Biogas.”

Keywords

Frequency combs
Isotope shifts
Optical detection
Periodically poled lithium niobate
Photoacoustic spectroscopy
Power spectral density

Access to Document

10.1364/OL.44.001142

Cite this

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abstract = "We report a photoacoustic spectroscopy setup with a high-power mid-infrared frequency comb as the light source. The setup is used in broadband spectroscopy of radiocarbon methane. Owing to the high sensitivity of a cantilever-enhanced photoacoustic cell and the high-power light source, we can reach a detection limit below 100 ppb in a broadband measurement with a sample volume of only a few milliliters. The first infrared spectrum of 14CH4 is reported and given a preliminary assignment. The results lay a foundation for the development of optical detection systems for radiocarbon methane.",

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AU - Karhu, Juho

AU - Tomberg, Teemu

AU - Vieira, Francisco Senna

AU - Genoud, Guillaume

AU - Hänninen, Vesa

AU - Vainio, Markku

AU - Metsälä, Markus

AU - Hieta, Tuomas

AU - Bell, Steven

AU - Halonen, Lauri

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AB - We report a photoacoustic spectroscopy setup with a high-power mid-infrared frequency comb as the light source. The setup is used in broadband spectroscopy of radiocarbon methane. Owing to the high sensitivity of a cantilever-enhanced photoacoustic cell and the high-power light source, we can reach a detection limit below 100 ppb in a broadband measurement with a sample volume of only a few milliliters. The first infrared spectrum of 14CH4 is reported and given a preliminary assignment. The results lay a foundation for the development of optical detection systems for radiocarbon methane.

KW - Frequency combs

KW - Isotope shifts

KW - Optical detection

KW - Periodically poled lithium niobate

KW - Photoacoustic spectroscopy

KW - Power spectral density

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