Abstract
The heat treatment of Ce, Eu-doped Sr0.61Ba0.39Nb2O6-δ (SBN) single crystals in an oxygen atmosphere, whereby samples are quenched after annealing to prevent any reaction during cooling, is discussed. We were able to obtain fairly good reproducibility with the quenching method. Photorefractive trap densities changed drastically as a result of the treatment, whereas absorption did not change significantly, and this is beneficial for volume multiplexing. For long-term data storage, we found that a lower annealing temperature was better. We discuss the effects of the treatment on the photorefractive properties of SBN in relation to oxygen vacancies.
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