  Magneto-optic behaviour is a specific, non-reciprocal example of gyrotropic
behaviour. When coupled to photo-induced Faraday rotation it is possible to
discriminate this effect from the background of other nonlinear effects
Non-reciprocal behaviour is characteristic of artificial gyrotropy and can be
used in optical isolators and a range of coherence and quantum problems. This
is all in sharp contrast to natural gyrotropy, like optical activity. it is
also important to go beyond third-order, Kerr, optical nonlinearity and move
towards a saturable model of terms in the polarisation. In this spirit, this
chapter seeks to determinate the influence of a magneto-optic presence upon an
optically nonlinear material that is modelled by a cubic-quintic form of
polarisation. In addition, the coefficients of the envelope equation will be
made complex, to take into account both linear and nonlinear damping and cubic
gain processes. The emphasis is upon the simulation outcomes, however, rather
the applications.
