Coupling of two chaotic lasers

Abstract Numerical solutions for two sets of equations describing lasers with intracavity saturable absorbers were studied for their instabilities associated to passive Q -switching. For realistic values of parameters of CO 2 lasers, we have demonstrated that two independent chaotic lasers can to into synchronized periodic oscillation after 3% of coupling. If both lasers start from periodic oscillation, after coupling they can go into either synchronized periodic or synchronized chaotic oscillations depending on the coupling strength. The coupling can be made either through absorber, laser gain or both.