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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 25, Iss. 21 — Nov. 1, 2000
  • pp: 1606–1608

Real-time detection of 13CH4 in ambient air by use of mid-infrared cavity leak-out spectroscopy

D. Kleine, H. Dahnke, W. Urban, P. Hering, and M. Mürtz  »View Author Affiliations


Optics Letters, Vol. 25, Issue 21, pp. 1606-1608 (2000)
http://dx.doi.org/10.1364/OL.25.001606


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Abstract

We report on spectroscopic real-time detection of <sup>13</sup>CH<sub>4</sub> in ambient air. Our measurements were carried out by means of cavity leak-out absorption spectroscopy employing a tunable cw laser in the mid-infrared spectral region near <i>λ</i> = 3 <i>μ</i>m. A CO laser in combination with tunable microwave sideband generation was used as the light source. Using a 50-cm-long ringdown cell with <i>R</i> = 99.98% mirrors, we achieved a detection limit of 290 parts in 10<sup>12</sup> (ppt) <sup>13</sup>CH<sub>4</sub> in ambient air (integration time, 100 s). The corresponding noise-equivalent absorption coefficient was 5 × 10<sup>-9</sup>/cm.

© 2000 Optical Society of America

OCIS Codes
(010.1120) Atmospheric and oceanic optics : Air pollution monitoring
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(300.6340) Spectroscopy : Spectroscopy, infrared

Citation
D. Kleine, H. Dahnke, W. Urban, P. Hering, and M. Mürtz, "Real-time detection of 13CH4 in ambient air by use of mid-infrared cavity leak-out spectroscopy," Opt. Lett. 25, 1606-1608 (2000)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-25-21-1606

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