Spatial Subharmonic Generation in Batio sub 3.
UKRAINIAN SSR ACADEMY OF SCIENCES KIEV
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Generation of spatial subharmonics is considered as a consequence of convective instability in parametric nonlinear mixing of tree copropagating coherent waves of the same frequency two incident pump waves and the scattered wave, propagating at the bisector of pump waves. Efficient amplification of the seed, scattered radiation can be achieved only for phase matched nonlinear mixing. For barium titanate it may be the mixing of two orthogonally polarized pump waves, ordinary and extraordinary, and the scattered extraordinary wave, all propagating in the plane normal to crystal C-axis. Subharmonic generation in BaTiO is the inverse process to the light-induced conical scattering of unique extraordinary wave. It can be described by the same equations as for anisotropic self diffraction but with the changed initial conditions.