The optically pumped 15{sup left}NH{sub}3 single mode ring laser can exhibit various types of chaotic dynamics. These include the period-doubling chaos, intermittency and the Lorenz-like spiral chaos. Based on the chaotic dynamics of the laser we have designed experiments to study the interaction between coupled chaotic systems. In this paper we report on results of our investigations. We demonstrate experimental evidence of frequency entrainment and generalized synchronization of chaos between unidirectionally coupled chaotic lasers, and the antiphase frequency entrainment, antiphase chaotic synchronization and perfect chaotic synchronization between mutually coupled chaotic laser modes. Analyzing properties of the various forms of chaotic synchronization observed, we speculate that the physical origin of synchronization between coupled chaotic systems is the phase interaction between the coupled chaotic evolutions. In particular, the different forms of chaotic synchronization observed are results of different stages of chaotic phase locking.
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