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Abstract
We report on a relation between the two-beam coupling gain factor Γ in Sr0·61Ba0·39Nb2O6 (SBN:0·6) crystals and their ferroelectric properties. In SBN:0·6 doped with rare-earth-metal impurities Ce and Tm we found a hysteresis dependence of Γ versus the external dc-field E applied after recording which is due to the ferroelectric P-E hysteresis. Particularly, Γ-E hysteresis manifests itself in an alteration of the sign of Γ, i.e., of the direction of the energy transfer between the coupling beams, under applying of E reversing Ps. The value of Γ at room temperature essentially increases with impurity concentrations. It is caused by an increase of the dielectric permittivity, which in its turn is due to a significant lowering of the phase-transition temperature Tc produced by a rare-earth doping.
