CASCADE EMISSION AND 4-WAVE-MIXING PARAMETRIC PROCESSES IN POTASSIUM

Strong stimulated cascade emission and coherent four-wave parametric r adiations are observed. By proper observation of the excitation spectr a, the cascade emission and the coherent four-wave mixing parametric p rocesses can be identified. The effect of the buffer gas pressure on t he intensity and the pulse compression of the emitted radiation were i nvestigated. Cascade inversionless coherent radiation emission with ab sorption reduction and third order nonlinear susceptibility enhancemen t due to the presence of a strong internally generated field are discu ssed for the 4p-4s strong emission observed. (C) 1996 American Institu te of Physics.