Abstract
We present a study of the saturated-absorption spectroscopy with crossover resonances involving both Cs hyperfine ground-state levels using a dual-frequency laser tuned to the Cs line. The crossover resonances are formed by the atomic velocity groups on resonance with both of the dual-frequency laser beams, which are counter-propagated through the vapor cell. A large increase in Doppler-free atomic absorption is observed for certain frequency differences of the dual-frequency laser. This phenomenon is explained by optical pumping and velocity selective optical pumping, imposed by the dual-frequency laser with frequency differences close to but not exactly equal to the level spacing of the two participating ground-state levels. The results obtained in this system are of great interest for laser spectroscopy.
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