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Intracavity Helium-Neon Laser Photothermal Deflection as a Sensitive Technique for Trace Gas Analysis

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A novel, compact, ultrasensitive, and inexpensive He-Ne laser intracavity photothermal deflection spectrometer has been developed. In this apparatus a gas sample is placed inside a cavity of the He-Ne laser, which serves as a probe laser. A CO2 excitation laser coaxially overlaps with the He-Ne laser beam inside the sample cell. The detection limit for ethanol vapor in air at 1 atm excited with 1.5 W of CO2 laser chopped at 13.3 Hz is estimated to be 2.5 ppb.

Keywords: Intracavity; Photothermal deflection; Trace gas analysis

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702864507837

Affiliations: Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53233

Publication date: November 1, 1986

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