Dynamics of multimode coupled lasers

The paper is concerned with a theoretical study of synchronization between two end-to-end coupled lasers. Lasers are treated within the framework of a special multimode theory, valid for arbitrary coupling between lasers, where the laser field is decomposed in terms of the composite-cavity modes of the entire coupled-laser system. Bifurcation continuation techniques are used to systematically investigate the resulting equations under class-A, and further under class-B approximation. We discovered that the mechanism leading to laser synchronization changes from strong composite-cavity mode competition in class-A regime to frequency locking of compositecavity modes in class-B regime.