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along the ferroelectric c axis in pure and chromium-doped crystals. We have studied four series of samples with various crystal compositions and doping concentrations to separate the influence of the intrinsic defects related to the non-stoichiometry and the effect of the introduction of chromium. In pure and slightly doped crystals, the electro-optic coefficient rc shows a non-monotonous dependence on the controlled crystal composition, which reflects a similar behaviour of the corresponding dielectric permittivity. In the highly Cr-doped crystals rc displays a large decrease with increasing Cr concentration whatever the crystal composition. The results have been discussed by means of the LiNbO3 structure and the substitution site dynamics.
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Received: 14 November 1997/Accepted: 2 January 1998
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Chah, K., Fontana, M., Aillerie, M. et al. Electro-optic properties in undoped and Cr-doped LiNbO3 crystals . Appl Phys B 67, 65–71 (1998). https://doi.org/10.1007/s003400050476
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DOI: https://doi.org/10.1007/s003400050476