Steady states for longitudinal modes and dynamics of a laser with a saturable absorber

Results of theoretical considerations of the steady states for longitudinal modes of a laser with a saturable absorber and the dynamics of such a laser are proposed. Intensities and frequencies of the steady states for modes and limits of their existence for the travelling wave ring laser are considered. Examples of bistability and of tristability in one mode, and of multistability due to coexistence of several modes at the same frequency, are given. Results of numerical simulations of the dynamical behaviour of intensity and frequency for some parameters are proposed. Effects of detunings of an active medium, absorber and cavity frequencies on the steady states and laser dynamics are studied.