Photorefractive properties of lithium and copper in-diffused lithium niobate crystals
Publication date
2002
Document type
Research article
Author
Organisational unit
Universität Osnabrück
Scopus ID
ISSN
Series or journal
Journal of the Optical Society of America B
Periodical volume
19
Periodical issue
8
First page
1822
Last page
1829
Part of the university bibliography
Nein
Abstract
Near-stoichiometric copper-doped lithium niobate crystals are fabricated by in-diffusion of thin layers of evaporated copper and a subsequent vapor transport equilibration treatment. The crystals are heated in a Li-rich atmosphere to increase the Li content. To determine the photorefractive properties, holographic as well as electrical measurements are performed. Saturation values of the refractive-index changes ΔnS, bulk photovoltaic current densities jphv, photoconductivities σ ph, and holographic sensitivities S are measured for light intensities up to 104 W/m2. Comparison with experimental data of congruent crystals indicates that the specific photoconductivity is 15 times larger after a vapor transport equilibration treatment. The specific bulk photovoltaic coefficient β* is 2 times larger, refractive-index changes are 7 times smaller, and the holographic sensitivity is up to 4 times larger. © 2002 Optical Society of America.
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