Photovoltaic effect in reduced crystals of lithium niobate

The photovoltaic current and the values of compensating field in the LiNbO3 crystals with different content of Fe addition and different reduction degree in the hydrogen media are measured. The photovoltaic current is shown to increase together with the Fe concentration growth and with the increase of reduction durability as well. Simultaneously the compensating field increases with the Fe concentration growth, but decreases while the reduction degree grows. The dependences obtained are used to explain some peculiarities of the holographic record in the reduces crystals