Abstract
Three effects of photochromism, bleaching and no-sensitization were found by us in lithium niobate (LN) with deep and shallow dopants. And two recording schemes were correspondingly proposed to record nonvolatile photorefractive holograms, in the first scheme two coherent red beams simultaneous with a UV light are used for recording and one red beam then for fixing, in the another two coherent red beams is used for recording and one red beam together with a UV light then for fixing. This paper presents a uniform theoretic analysis. The two-center band-transport equations together with the wave coupling equations are used and the optimal conditions for processing and material prescriptions are found. Particularly, the lithium niobate crystals doped with Fe:Mn, Ce:Mn, Fe:Cu and Ce:Cu are discussed in detail, which include the dopant concentrations, the oxidation/reduction states, the intensities of UV-sensitizing light and two red recording beams. The supporting experimental results are outlined, too. Both theoretic and experimental results verify that the LN:Ce:Cu has the best performance among the four kinds of doped crystals.
Published Version
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