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Proceedings Paper

Multi-species gas detection with long-wavelength VCSEL
Author(s): Alexandre Lytkine; Wolfgang Jaeger; John Tulip
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Paper Abstract

A long-wavelength VCSEL has been used for the first time for multi-species gas detection and for trace gas sensing. The VCSEL with a buried tunnel junction (VERTILAS, Germany) was capable of covering a spectral range of 7 nm or 28 cm-1 (central wavelength at 1576.3 nm) with the laser temperature and injection current varied between 0-50 °C and 0.5-5 mA respectively. The pressure of CO:CO2=3:2 gas mixtures buffered with N2 (N2 content 0 - 90 %) was varied from 1 mBar up to 1 Bar. To avoid a non-linear dynamic tuning, the combination of a direct injection current with a saw-tooth waveform was used to sweep the laser frequency across absorption lines. A LabVIEW-based computer code was developed for multi-species gas analysis in time domain. Absorption spectra were averaged over 102-103 laser scans. It has been shown that a cross interference from all collisional partners should be taken into account for accurate multi-component gas detection. A concentration of 600 ppm of CO2 in atmospheric air (fractional absorption ~ 10-4) was detected with laser output power of 120 uW. Long-wavelength VCSELs can be used both for multi-species gas detection in a wide range of pressures and for trace gas monitoring.

Paper Details

Date Published: 20 December 2004
PDF: 9 pages
Proc. SPIE 5594, Physics and Applications of Optoelectronic Devices, (20 December 2004); doi: 10.1117/12.570059
Show Author Affiliations
Alexandre Lytkine, Univ. of Alberta (Canada)
Wolfgang Jaeger, Univ. of Alberta (Canada)
John Tulip, Univ. of Alberta (Canada)


Published in SPIE Proceedings Vol. 5594:
Physics and Applications of Optoelectronic Devices
Joachim Piprek, Editor(s)

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