Nonisochronism of the self-modulation oscillation frequency in a solid-state ring laser

The dependence of the frequency of self-modulation oscillations of the first kind in a solid-state ring laser on its parameters is studied theoretically and experimentally. It is shown that the nonisochronism takes place: the self-modulation oscillation frequency depends on the intracavity field intensity. The influence of the amplitude — phase coupling on the nonlinear frequency shift of self-modulation oscillations, depending on the excess of the pump over the threshold, is studied. Comparison of the experimental results with theoretical data made it possible to determine the amplitude—phase coupling coefficient.