Abstract
Two kinds of nonlinear optical effect in a material under the influence of a static magnetic field are theoretically discussed, that is, two-photon transition between magnetic energy levels and a light-intensity-dependent Faraday rotation. Optical anisotropy induced by an intense light beam in a material is compared with that due to a magnetic field. A circularly polarized light acts as an effective magnetic field. Properties of the conductivities describing these nonlinear effects are considered from the quantum mechanical expression of the conductivity tensor. In II–VI semiconductors, the symmetric-tensor component of the nonlinear conductivity induced by the optical field of several tens of megawatts is the comparable order of magnitude to the antisymmetric-tensor component of the linear conductivity due to the magnetic field of several hundred gausses. The nonlinear Faraday rotation is proportional to the magnetization in magnetic materials.
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