Abstract
We show that there are three distinct regions corresponding to the internally produced axial parametric emissions. Namely an exponentially grown region, of the 5P(3/2)-4S(1/2) emission, as a function of the laser peak intensity, a linear region due to mainly to the destructive quantum interference of the pump excitation and the produced emissions, and a region of complete saturation due to the considerable transfer of population to the excited states and the activation of an alternative available emission path.