Four-wave mixing and parametric four-wave mixing near the 4P-4S transition of the potassium atom

摘要

Potassium 4S(1/2)-6S(1/2) two-photon excitation initiates the emission of several internally generated photons. For the first time two emission lines, one close to and one below the potassium 4P(3/2) level, are reported for low pumping intensity. Radiation emitted below the 4P3/2 level is due to a parametric four-wave mixing at the 5P(3/2)-4S(1/2) transition and a two-process that uses the photons emitted step four-wave mixing process generates the line emitted close to the 4P(3/2) level. [References: 27]