Detuning Induced Effects: Symmetry-breaking Bifurcations in Dynamic Model of One-mode Laser

The concept of broken symmetry is used to study bifurcations of equilibria and dynamical instabilities in dynamic model of one-mode laser (nonresonant complex Lorenz model) on the basis of modified Hopf theory. It is shown that an invariant set of stationary points bifurcates into an invariant torus (doubly-periodic branching solution). Influence of the symmetry breaking on stability of branching solutions is investigated as a function of detuning. The invariant torus is found to be stable under the detuning exceeds its critical value, so that dynamically broken symmetry results in the appearance of low frequency Goldstone-type mode. If the detuning then goes downward and pumping is kept above the threshold, numerical analysis reveals that after a cascade of period-doublings the strange Lorenz attractor is formed at small values of detuning. It is found that there are three different types of the system behaviour as pumping increases depending on the detuning. Quantum counterpart of the complex Lorenz model is discussed. PACS numbers: 42.60Mi, 42.65Sf, 05.45+b, 82.20Mj ∗E-mail: [email protected]