NONLINEAR DYNAMICS OF LASER SYSTEMS AT INTRACAVITY MODULATION OF POLARIZATION

The eigenmode behavior in a resonator and coupled amplitude-polarizati on dynamics of a HeNe laser operating at lambda = 1.15 mu m with modul ation of anisotropy directions is analyzed analytically and numericall y. It is shown that uniform rotation of the directions of the anisotro py results in changes of both the azimuth and ellipticity of the polar ization state in the stable lasing regime as well as in periodic dynam ics. Modulation by means of nonuniform rotation of the anisotropy indu ces a parametric resonance phenomenon and quasi-periodic oscillations of the emitted wave parameters. The resonator and laser systems under conditions of parametric resonance can exhibit a sudden change of fiel d polarization parameters because of ''quenching'' of part of the spec tral harmonics appearing as a result of modulation.