Effect of the coherent population trapping on saturated absorption resonances in Cs vapor

We have detected and analysed interesting features of sub-Doppler resonances, which are induced in absorption of the weak monochromatic probe light beam (with the scanned frequency) by the counterpropagating two-frequency pumping radiation implementing the phenomenon of the coherent population trapping (CPT) on resonant Λ-systems of atomic levels. Our experimental investigations have been carried out on example of spectral components of the Doppler broadened D₂ line of cesium atoms. Obtained results may be used for optimization of laser frequencies stabilization on atomic transitions.