Abstract
Chaotic transients have been experimentally observed in a CO 2 laser with modulated losses, a system which exhibits generalized bistability and chaos with different kinds of crises. In addition to the expected critical slowing down obtained when the laser modulation is switched towards a point in the vicinity of a bifuraction point, transients of different kinds appeared depending on the region of the bifuraction diagram which was explored. In particular, long-lived transients and crisis-induced intermittency were obtained when the control parameter is switched to a value for which the chaotic attractor has undergone a crisis. Switching inside one chaotic region allows to temporarily observe the unstable cycles which were predicted in previous theoretical studies. The existence of crisis-induced intermittency and of the unstable cycles is clearly related to the excitation caused by the switching and not to noise-induced jumps between different attractors. All the observed behaviours are consistent with those which were obtained in numerical simulations on a two-level model of the CO 2 laser with modulated losses.
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