Phase instability in a single-mode anisotropic-cavity solid-state laser

Symmetry properties of an experimentally tested model of a single-mode anisotropic diodepumped Nd:YAG laser are analyzed. Experimentally revealed regularities are explained. A number of new effects of nonlinear dynamics were discovered—the bistability of asymmetric two-frequency periodic and chaotic regimes of lasing of waves with linear orthogonal states of polarization, as well as the lasing regimes that are sensitive to the action of random fluctuations. These regimes appear as a result of the stochastization of periodic oscillations when passing the line of birth of a stable limit cycle close to the lasing threshold.