Measurement of the absolute absorption coefficient by intraresonator laser spectroscopy

The intraresonator laser spectroscopy makes it possible to increase considerably the sensitivity in absorption analysis but the optical path has to be varied and this makes it difficult to obtain quantitative values of the absorption coefficient. It is shown that this coefficient can be deduced from time scans of the stimulated emission spectra. The absorption coefficients of some of the CO₂ lines are determined in this way. The values obtained are in good agreement with the published absorption coefficients measured by the standard method with a constant optical path.