Abstract

The theoretical bases of saturated-absorption cavity ring-down (SCAR) spectroscopy are treated and described in detail in different transition broadening regimes. All the approximations that are introduced to achieve a model as simple and accurate as possible are discussed. In the Voigt broadening regime, a calibration factor that relates the measured spectral areas in the saturated and linear absorption regimes is retrieved. A relevant application of this technique to the measurement of radiocarbon dioxide concentration at both enriched and natural abundance ($\sim {10}^{-12}$) is presented. The population relaxation rate of one ro-vibrational state of the ${\nu }_3$ band is measured for this highly diluted ${\mathrm{CO}}_2$ isotopologue.

© 2015 Optical Society of America

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