Influence of post-growth treatment on the holographic storage properties of In:Fe:LiNbO3
The congruent In (3 mol%):Fe (0.03 wt%): LiNbO3 crystal has been grown by Czochralski method in air. Some crystal samples were reduced in Li2CO3 powder, and others were oxidized in Nb2O5 powder. The defects and ions location in crystal were investigated by infrared (IR) transmission spectrum. The photorefractive properties were measured by two-wave coupling and light-induced scattering resistance experiments. In the oxidized sample, the photovoltaic effect was the dominant process during recording. However, for the as-grown sample as well as the reduced, the photorefractive effect was governed by the diffuse field and the photovoltaic field, together. In addition, the reduction treatment made the photoconductivity increase, which resulted in shorter erasure time and lower diffraction efficiency, but higher light-induced scattering resistance ability. The oxidation treatment caused the inverse effect.
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Document Type: Research Article
Affiliations: Electro-Optics Technology Center, Harbin Institute of Technology, Harbin 150001, P. R. China
Publication date: 2004-08-01