K(6S-4P) parametric emission excited by bound-bound transitions of NaK

The authors have studied extensively the stimulated emission at 691.1 nm and 693.9 nm identified as 6S-4P1/2, 3/2 transitions in potassium. The origin of the emission is thought to be four-wave parametric emission induced by hybrid transitions. The stimulated emission is enhanced by cascading transitions, the presence of nearby atomic states, stimulated electronic Raman scattering and molecular background signal. Excitation, absorption and emission measurements indicate that bound-bound NaK(X-B) transitions play a dominant role. The rate of energy transfer NaK to K is evaluated as kET approximately=2.3*10-9 cm3s-1.