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A photoacoustic intracavity configuration is presented; a resonant photoacoustic cell excited in its first longitudinal mode is placed inside the cavity of a CO waveguide laser. Due to the high laser power and the sharp intracavity focus, saturation effects occur in the excitation and relaxation process of absorbing CH molecules. A more optimal configuration is applied to measure the CH emission of several  species. A detection sensitivity of 6 ppt (parts per trillion) CH is reached, equivalent to a minimal detectable absorption of 1.8×10 cm.

Sensitive intracavity photoacoustic measurements with a CO2 waveguide laser