We report on contribution from ferroelectric phenomena to the two-beam coupling gain factor Γ in Sr0.6Ba0.4.Nb2O6 crystals doped with rare-earth elements. The values of Γ are sensitive to the ferroelectric phase transition and may be controlled by a variation in Tc which is achieved, in particular by doping SBN with rare-earth impurities..

© 1999 Optical Society of America

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