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Photorefractive Properties of Cobalt-Doped Barium Titanate

  • J. Y. Chang (a1), M. H. Garrett (a2), H. P. Jenssen (a2), C. Warde (a3) and P. Tayebati (a4)...


A series of cobalt-doped barium titanate crystals were grown that have high beam-coupling gain. Our photorefractive characterization shows that with increasing cobalt concentration in the crystal a deep level is formed and the relative effect of shallow levels on the space-charge field amplitude diminishes. This gives the crystal a long dark storage time. We find that cobalt-doping in barium titanate increases the two-beam coupling gain by reducing the dark conductivity and increasing the total effective trap density.



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