Appearance of the frequency nonreciprocity in a ring chip laser with modulated coupling coefficients of counterpropagating waves

The effect of harmonic modulation of the coupling coefficients of counterpropagating waves on the type of generation of a solid-state Nd:YAG laser is studied. It is shown that, as the modulation depth is increased, transient generation regimes appear in the laser, which are accompanied by considerable frequency nonreciprocity. The boundaries of the regions of existence of different lasing regimes are found.