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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 36, Iss. 30 — Oct. 20, 1997
  • pp: 8042–8049

Room-temperature mid-infrared laser sensor for trace gas detection

Thomas Töpfer, Konstantin P. Petrov, Yasuharu Mine, Dieter Jundt, Robert F. Curl, and Frank K. Tittel  »View Author Affiliations


Applied Optics, Vol. 36, Issue 30, pp. 8042-8049 (1997)
http://dx.doi.org/10.1364/AO.36.008042


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Abstract

Design and operation of a compact, portable, room-temperature mid-infrared gas sensor is reported. The sensor is based on continuous-wave difference-frequency generation (DFG) in bulk periodically poled lithium niobate at 4.6 µm, pumped by a solitary GaAlAs diode laser at 865 nm and a diode-pumped monolithic ring Nd:YAG laser at 1064.5 nm. The instrument was used for detection of CO in air at atmospheric pressure with 1 ppb precision (parts in 109, by mole fraction) and 0.6% accuracy for a signal averaging time of 10 s. It employed a compact multipass absorption cell with a 18-m path length and a thermoelectrically cooled HgCdTe detector. Precision was limited by residual interference fringes arising from scattering in the multipass cell. This is the first demonstration of a portable high-precision gas sensor based on diode-pumped DFG at room temperature. The use of an external-cavity diode laser can provide a tuning range of 700 cm-1 and allow the detection of several trace gases, including N2O, CO2, SO2, H2CO, and CH4.

© 1997 Optical Society of America

History
Original Manuscript: January 24, 1997
Revised Manuscript: April 30, 1997
Published: October 20, 1997

Citation
Thomas Töpfer, Konstantin P. Petrov, Yasuharu Mine, Dieter Jundt, Robert F. Curl, and Frank K. Tittel, "Room-temperature mid-infrared laser sensor for trace gas detection," Appl. Opt. 36, 8042-8049 (1997)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-36-30-8042

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