TRAVELING KINKS IN HOMOGENEOUSLY BROADENED LASERS WITH INTRACAVITY PARAMETRIC AMPLIFICATION

A complex order parameter equation describing the nonlinear dynamics n ear threshold of a homogeneously broadened class-A ring laser with an intracavity parametric amplifier is derived starting from the multimod e Maxwell-Bloch laser equations in the limit of a very large cavity le ngth. It is shown that, when the parametric amplifier is turned on, tr aveling kink pulses may stably propagate in the cavity. These localize d structures bear an interesting analogy with Bloch domain walls in fe rromagnets.