Applied Physics B

, Volume 75, Issue 2, pp 305–310

Trace-gas sensing in the 3.3-μm region using a diode-based difference-frequency laser photoacoustic system

  • C. Fischer
  • M.W. Sigrist

DOI: 10.1007/s00340-002-0982-9

Cite this article as:
Fischer, C. & Sigrist, M. Appl Phys B (2002) 75: 305. doi:10.1007/s00340-002-0982-9


A compact, diode-based difference-frequency laser system combined with a photoacoustic detection scheme is presented for trace-gas sensing. It features a broad, continuous tuning range (3.2–3.7 μm), a narrow line width (154 MHz), and room-temperature operation, and thus allows numerous gas species to be measured both isolated and in mixtures of different gases. Several trace-gas species of environmental interest were detected, and gas mixtures were analysed. The detection limits are in the low-ppmV range, e.g. 1.3 ppmV for methane, 1.8 ppmV for ethane, and 1.2 ppmV for hydrogen chloride.

PACS: 42.62.Fi; 42.65.Ky; 07.07.Df; 42.68.Ca 

Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • C. Fischer
    • 1
  • M.W. Sigrist
    • 1
  1. 1.Swiss Federal Institute of Technology (ETH), Institute of Quantum Electronics, Hönggerberg, 8093 Zürich, SwitzerlandCH

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