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Applied Optics

Applied Optics


  • Vol. 38, Iss. 21 — Jul. 20, 1999
  • pp: 4691–4698

On-line multicomponent trace-gas analysis with a broadly tunable pulsed difference-frequency laser spectrometer

Michael Seiter and Markus W. Sigrist  »View Author Affiliations

Applied Optics, Vol. 38, Issue 21, pp. 4691-4698 (1999)

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The design and application of a novel automated room-temperature laser spectrometer are reported. The compact instrument is based on difference-frequency generation in bulk LiNbO3. The instrument employs a tunable cw external-cavity diode laser (795–825 nm) and a pulsed diode-pumped Nd:YAG laser (1064 nm). The generated mid-IR nanosecond pulses of 50-µW peak power and 6.5-kHz repetition rate, continuously tunable from 3.16 to 3.67 µm, are coupled into a 36-m multipass cell for spectroscopic studies. On-line measurements of methane are performed at concentrations between 200 ppb (parts in 109 by mole fraction) and ≈1%, demonstrating a large dynamic range of 7 orders of magnitude. Furthermore computer-controlled multicomponent analysis of a mixture containing five trace gases and water vapor with an overall response time of 90 s at an averaging time of only ≈30 s is reported. A minimum detectable absorption coefficient of 1.1 × 10-7 cm-1 has been achieved in an averaging time of 60 s, enabling detection limits in the ppb range for many important trace gases, such as CH4, C2H6, H2CO, NO2, N2O, HCl, HBr, CO, and OCS.

© 1999 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
(190.2620) Nonlinear optics : Harmonic generation and mixing
(280.3420) Remote sensing and sensors : Laser sensors
(300.6340) Spectroscopy : Spectroscopy, infrared

Original Manuscript: December 14, 1998
Revised Manuscript: March 23, 1999
Published: July 20, 1999

Michael Seiter and Markus W. Sigrist, "On-line multicomponent trace-gas analysis with a broadly tunable pulsed difference-frequency laser spectrometer," Appl. Opt. 38, 4691-4698 (1999)

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