The features of the frequency and amplitude characteristics of ring lasers, which contain a resonantly absorbing medium inside the resonator, are investigated. It is established that the presence of a medium with anomalous dispersion leads to a substantial increase in the dependence of the intrinsic generation frequencies and the difference in frequencies of opposed waves of the ring laser on the perimeter of the resonator and the magnitude of the optical nonmutuality. It is shown that stationary generation becomes unstable in a ring laser in the region of negative values of the group speed of light.
Research Institute of Nuclear Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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