Methane concentration and isotopic composition measurements with a mid-infrared quantum-cascade laser

A. A. Kosterev; R. F. Curl; F. K. Tittel; C. Gmachl; F. Capasso; D. L. Sivco; J. N. Baillargeon; A. L. Hutchinson; A. Y. Cho

doi:10.1364/OL.24.001762

Methane concentration and isotopic composition measurements with a mid-infrared quantum-cascade laser

A. A. Kosterev, R. F. Curl, F. K. Tittel, C. Gmachl, F. Capasso, D. L. Sivco, J. N. Baillargeon, A. L. Hutchinson, A. Y. Cho

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

134 Scopus citations

Abstract

A quantum-cascade laser operating at a wavelength of 8.1 μm was used for high-sensitivity absorption spectroscopy of methane (CH₄). The laser frequency was continuously scanned with current over more than 3 cm^-1, and absorption spectra of the CH₄ v₄ P branch were recorded. The measured laser linewidth was 50 MHz. A CH₄ concentration of 15.6 parts in 10⁶ (ppm) in 50 Torr of air was measured in a 43-cm path length with ±0.5-ppm accuracy when the signal was averaged over 400 scans. The minimum detectable absorption in such direct absorption measurements is estimated to be 1.1 × 10^-4. The content of ¹³CH₄ and CH₃D species in a CH₄ sample was determined.

Original language	English (US)
Pages (from-to)	1762-1764
Number of pages	3
Journal	Optics Letters
Volume	24
Issue number	23
DOIs	https://doi.org/10.1364/OL.24.001762
State	Published - Dec 1 1999
Externally published	Yes

All Science Journal Classification (ASJC) codes

Atomic and Molecular Physics, and Optics

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10.1364/OL.24.001762

Cite this

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title = "Methane concentration and isotopic composition measurements with a mid-infrared quantum-cascade laser",

abstract = "A quantum-cascade laser operating at a wavelength of 8.1 μm was used for high-sensitivity absorption spectroscopy of methane (CH4). The laser frequency was continuously scanned with current over more than 3 cm-1, and absorption spectra of the CH4 v4 P branch were recorded. The measured laser linewidth was 50 MHz. A CH4 concentration of 15.6 parts in 106 (ppm) in 50 Torr of air was measured in a 43-cm path length with ±0.5-ppm accuracy when the signal was averaged over 400 scans. The minimum detectable absorption in such direct absorption measurements is estimated to be 1.1 × 10-4. The content of 13CH4 and CH3D species in a CH4 sample was determined.",

author = "Kosterev, \{A. A.\} and Curl, \{R. F.\} and Tittel, \{F. K.\} and C. Gmachl and F. Capasso and Sivco, \{D. L.\} and Baillargeon, \{J. N.\} and Hutchinson, \{A. L.\} and Cho, \{A. Y.\}",

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doi = "10.1364/OL.24.001762",

language = "English (US)",

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TY - JOUR

T1 - Methane concentration and isotopic composition measurements with a mid-infrared quantum-cascade laser

AU - Kosterev, A. A.

AU - Curl, R. F.

AU - Tittel, F. K.

AU - Gmachl, C.

AU - Capasso, F.

AU - Sivco, D. L.

AU - Baillargeon, J. N.

AU - Hutchinson, A. L.

AU - Cho, A. Y.

PY - 1999/12/1

Y1 - 1999/12/1

N2 - A quantum-cascade laser operating at a wavelength of 8.1 μm was used for high-sensitivity absorption spectroscopy of methane (CH4). The laser frequency was continuously scanned with current over more than 3 cm-1, and absorption spectra of the CH4 v4 P branch were recorded. The measured laser linewidth was 50 MHz. A CH4 concentration of 15.6 parts in 106 (ppm) in 50 Torr of air was measured in a 43-cm path length with ±0.5-ppm accuracy when the signal was averaged over 400 scans. The minimum detectable absorption in such direct absorption measurements is estimated to be 1.1 × 10-4. The content of 13CH4 and CH3D species in a CH4 sample was determined.

AB - A quantum-cascade laser operating at a wavelength of 8.1 μm was used for high-sensitivity absorption spectroscopy of methane (CH4). The laser frequency was continuously scanned with current over more than 3 cm-1, and absorption spectra of the CH4 v4 P branch were recorded. The measured laser linewidth was 50 MHz. A CH4 concentration of 15.6 parts in 106 (ppm) in 50 Torr of air was measured in a 43-cm path length with ±0.5-ppm accuracy when the signal was averaged over 400 scans. The minimum detectable absorption in such direct absorption measurements is estimated to be 1.1 × 10-4. The content of 13CH4 and CH3D species in a CH4 sample was determined.

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JO - Optics Letters

JF - Optics Letters

IS - 23

ER -

Methane concentration and isotopic composition measurements with a mid-infrared quantum-cascade laser

Abstract

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