NONLINEAR-THEORY OF LASING WITH OR WITHOUT INVERSION IN A SIMPLE 3-LEVEL ATOMIC SYSTEM

We investigate, using a nonlinear theory of laser physics, for a simpl e three-level atomic system the steady-state intensity behavior due to the effects of quantum coherence and decoherence, We find that a chan ge from a noninversion laser to an inversion laser action can occur as the Rabi frequency of the driving field increases. The steady-state i ntensity of the laser field can arrive at a maximal value for a certai n Rabi frequency of the driving field. We also find that the linear ga in and the laser intensity tend to decrease for the linewidth of the d riving field.