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1 2017

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Electro-optic coefficients of a non-congruent lithium niobate fabricated by vapour transport equilibration : Composition effect

Xu J.-Q., Du W.-Y…, Sua Q., Wong W.-H., Yu D.-Y., Pun E. Y.-B., Zhang D.-L.

Opto-Electronics Review

2017

Vol. 25, No. 2

89--92

Composition effect on electro-optic (EO) properties of a LiNbO₃ (LN) single-crystal has been investigated in a Li₂O-content range of 47.0-49.95 mol%. Some non-congruent LN crystals with different Li₂O-contents were prepared by performing Li-deficient or Li-rich vapour transport equilibration treatments on as-grown congruent LN crystals. Unclamped EO coefficients γ₁₃ and γ₃₃ of these samples were measured by a Mach-Zehnder interferometric method. The measurements show that in the Li-deficient regime both γ₁₃ and γ₃₃ increase by ∼8% as Li₂O-content decreases from the congruent 48.6 mol% to the 47.0 mol% in the Li-deficient regime. The feature is desired for the EO application of the Li-deficient crystal. In the near-stoichiometric regime, both γ ₁₃ and γ₃₃ reveal a non-monotonic dependence. As the Li₂O-content increases from the 48.6 mol%, the EO coefficient decreases. Around Li₂O-content 49.5 mol%, a minimum is reached. After that, the EO coefficient recovers slowly. At the stoichiometric composition, it recovers to a value close to that at the congruent point. Comparison shows that different crystal growth methods give rise to different defect structure features and hence different composition effects.