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Applied Physics B

, Volume 72, Issue 1, pp 127–135 | Cite as

Near shot noise detection of oxygen in the A-band with vertical-cavity surface-emitting lasers

  • P. Vogel
  • V. Ebert
Article

Abstract.

A dual-beam laser absorption spectrometer with balanced detection for high sensitivity detection of oxygen via the A-band at 760 nm is described. The 2×2 vertical-cavity surface-emitting laser arrays used for this set-up are characterized by their wavelength tuning behavior with temperature and current, amplitude modulation, side-mode suppression ratio and polarization contrast. The spectrometer performance is determined over time periods of up to 10 h using the variation in the differential absorption between two beam paths. With the R11R11 line at STP, 670 μW laser power and 200 mm-long absorption cells, we realized an excellent linearity (R=0.9999) and over a 5-min interval a record sensitivity for VCSEL-based spectrometers of 35 ppmV, corresponding to an optical density (O.D.) of 7×10-7. For this specific set-up, this sensitivity is only a factor of 2.7 above the shot noise limit, giving us a normalized detection limit of 7.6 ppmV·m· Open image in new window . Over a 10-h interval we achieved a standard deviation of 65 ppmV.

PACS: 82.80.C; 42.62.F; 42.55.P 

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Copyright information

© Springer-Verlag 2000

Authors and Affiliations

  • P. Vogel
    • 2
  • V. Ebert
    • 1
  1. 1.Physikalisch-Chemisches Institut, Universität Heidelberg, INF 253, 69120 Heidelberg, Germany (Fax: +49-6221/54-5050, E-mail: volker.ebert@urz.uni-heidelberg.de)DE
  2. 2.Infineon Technologies, Wernerwerkstr. 2, 93049 Regensburg, GermanyDE

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