Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

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

Not Accessible

Your library or personal account may give you access

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 ν4 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 ±0.5ppm 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.

© 1999 Optical Society of America

Full Article  |  PDF Article
More Like This
Water-vapor isotope ratio measurements in air with a quantum-cascade laser spectrometer

L. Joly, V. Zéninari, B. Parvitte, D. Courtois, and G. Durry
Opt. Lett. 31(2) 143-145 (2006)

Carbonyl sulfide detection with a thermoelectrically cooled midinfrared quantum cascade laser

Chad Roller, Anatoliy A. Kosterev, Frank K. Tittel, Kiyoji Uehara, Claire Gmachl, and Deborah L. Sivco
Opt. Lett. 28(21) 2052-2054 (2003)

Kilohertz linewidth from frequency-stabilized mid-infrared quantum cascade lasers

Richard M. Williams, James F. Kelly, John S. Hartman, Steven W. Sharpe, Matthew S. Taubman, John L. Hall, Federico Capasso, Claire Gmachl, Deborah L. Sivco, James N. Baillargeon, and Alfred Y. Cho
Opt. Lett. 24(24) 1844-1846 (1999)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (4)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved