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Charge transport in highly iron-doped oxidized lithium niobate single crystals

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Abstract

The photorefractive properties of highly iron-doped lithium niobate crystals in as-grown and completely oxidized states are investigated. Iron concentrations range from 0.5 to 3 wt. %. Measurements of light-induced refractive-index changes, two-beam coupling gain, bulk-photovoltaic current densities, and conductivities are performed with visible light. Absorption spectra and the bulk photovoltaic currents are used to determine the Fe2+ concentration. The dark conductivity confirms the tunneling model for charge-carrier migration. Beam-coupling experiments as well as photocurrent measurements with highly oxidized samples indicate that the one-center model is valid in such highly doped crystals, but that hole conductivity dominates the charge transport.

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Authors and Affiliations

  1. Institute of Physics, University of Bonn, Wegelerstr. 8, 53115, Bonn, Germany

    M. Falk, J. Japs, T. Woike & K. Buse

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  1. M. Falk
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  2. J. Japs
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  3. T. Woike
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  4. K. Buse
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Correspondence to M. Falk.

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PACS

72.20.Jv; 72.40.+w; 81.40.Tv

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Falk, M., Japs, J., Woike, T. et al. Charge transport in highly iron-doped oxidized lithium niobate single crystals. Appl. Phys. B 87, 119–122 (2007). https://doi.org/10.1007/s00340-006-2550-1

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  • DOI: https://doi.org/10.1007/s00340-006-2550-1

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