Photoelectric and photorefractive properties of cerium-doped barium strontium niobate crystals

An investigation was made of the photoelectric and photorefractive properties of barium strontium niobate crystals having the composition (Sr_xBa_1–x)_1–y(NB₂O₆)_y where x =0.61 and y =0.4993, doped with 0.05 and 0.10 wt.% CeO₂. The crystals have the following characteristics: a sensitivity of 2×10^–3 cm²/J at λ = 0.44 μ with spatial frequencies of 700–2000 lines/mm, a data storage time exceeding 9 months, a maximum diffraction efficiency exceeding 50%, and an unlimited number of read-write cycles. It was established that the holograms were recorded by a diffusion mechanism.