Abstract
A photoacoustic intracavity configuration is presented; a resonant photoacoustic cell excited in its first longitudinal mode is placed inside the cavity of a CO2 waveguide laser. Due to the high laser power and the sharp intracavity focus, saturation effects occur in the excitation and relaxation process of absorbing C2H4 molecules. A more optimal configuration is applied to measure the C2H4 emission of several Rumex species. A detection sensitivity of 6 ppt (parts per trillion) C2H4 is reached, equivalent to a minimal detectable absorption of 1.8×10−10 cm−1.
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Harren, F.J.M., Bijnen, F.G.C., Reuss, J. et al. Sensitive intracavity photoacoustic measurements with a CO2 waveguide laser. Appl. Phys. B 50, 137–144 (1990). https://doi.org/10.1007/BF00331909
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DOI: https://doi.org/10.1007/BF00331909