Abstract
In experimental investigations of a singlemode CO2 laser with external modulation a generized multistability is observed that characterizes coexistence of two regular attractors with frequencies f/2 and f/3, where f is the modulation frequency.1 Numerical investigation of the simple model of this laser has shown that four attractors may coexist if the modulation frequency coincides with relaxation-oscillation frequency.2 In a laser with a saturable absorber we found a parameter region in which six regular attractors may coexist and as the laser parameters vary their number varies as well.3 Unlike in a laser with active modulation, coexisting solutions have a pulse shape containing a single pulse and oscillating spikes. This pulse shape is similar to the one obtained experimentally. We have hypothesized that the appearance of the oscillations is connected directly with an eigenvalue spectrum of nonzero saddle steady states, namely, with two complex eigenvalues with negative real parts. We believe the regimes to be connected with accidental switching of the phase of the field in the experiments.4
© 1993 Optical Society of America
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