Abstract
We study the generation of radiation at the 5P(3/2)-4S(1/2) transition of potassium vapor under excitation of the 4S(1/2)-6S(1/2) two-photon resonance. The model consists of the coupled Maxwell-Bloch equations for a four-level configuration of Potassium atom including states 4S, 4P, 5P and 6S, which is numerically solved. Previous experimental studies have shown the emission of Parametric Four-Wave Mixing (PFWM) radiation near the 5P(3/2)-4S(1/2) transition at low vapor pressures (p<10(14) atoms/cm(3)) which is also shown in the case of the model studied.