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Wave mixing and quantum interference effect in potassium atoms

Experimental results are presented related to the wave mixing in K. The influence of the medium number density, the incident radiation intensity and the detuning from resonance on the spectral, spatial and temporal characteristics of the radiation emitted near the 5P-4S transition is investigated for the 4S1/2 - 6S1/2 two-photon excitation. The different processes involved and the quantum interference is examined.