Abstract
We report the dependence of the unit-cell parameters and the extraordinary and ordinary refractive indices of Er3+/Yb3+-codoped LiNbO3 crystals. Both properties depend in a non-monotonic manner on the Er3+/Yb3+ content. A singularity was observed at concentrations of 1.1-1.2 mol. % in the crystal (0.6-0.7 mol. % in the melt). In the same way the Er and Yb concentration influences the periodically poled lithium niobate formation. The observed behavior of refractive indices and unit-cell parameters of Er3+/Yb3+-codoped LiNbO3 crystals could be explained in terms of the RE3+-ion concentration affecting the Li-vacancy concentration and the RE3+-ion positions in the crystal.
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