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In this work some aspects of point defects produced in lithium niobate crystals by doping and thermal treatments are studied. The effect of oxidation and reduction processes on pure and doped samples is analyzed. In particular, results of visible and infrared optical absorption, photovoltaic behavior, paramagnetic resonance and holographic fixing parameters are considered to understand the photorefractive...
We observed developing light intensity dependence of the diffraction efficiency of thermally fixed holograms in LiNbO 3 :Fe. The diffraction efficiency decreases for low illumination. At high intensity there was obtained a saturation effect. This dependence was weaker for highly oxidized crystals. The proper description of the results seems to require a two-photorefractive-center model. This...
We have investigated the properties of thermally fixed holograms in LiNbO3 crystals doped with the optical damage inhibitor Zn as well as the photorefractive Fe dopants. Time decays of fixed holograms at different temperatures showed a single thermally activated process with an activation energy of ∼1.08 eV. We have also studied the effect of an external electric field on the diffraction efficiency...
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