Optical phase conjugation via SBS in magnetoactive semiconductors in the 10.6 micron regime

The authors´ work deals with the analytical investigation of OPC-SBS in a Brillouin cell containing a semiconducting crystal, under a pump intensity dependent absorption regime. For a Brillouin cell of micron size, the waveguide structure has been replaced by a simple plane wave formalism. In order to examine critically the dependence of the reflectivity coefficient on the material parameters, the crystal has been considered to be n-type with doping concentration being an externally controllable parameter. A purely electromagnetic treatment has been followed where the crystal is assumed to behave like a semiconductor-plasma such that the dynamic behaviour of this medium can be explained by the hydrodynamic model. The third order optical susceptibility, responsible for the occurrence of OPC and known as the Brillouin susceptibility (χ_B), has been obtained by following the coupled mode approach