Polarization domains in nonlinear optics
Zakharov V. E. , Mikhailov A. V.
Stable (ground) polarization states have been found in the case of the propagation of electromagnetic waves in opposite directions in a mirror-symmetry medium with a cubic nonlinearity along a fourfold axis if the optical Kerr self-effect is ignored. The evolution of an arbitrary initial polarization gives rise to a "domain structure." Explicit solutions describing domain walls are found.