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Clamped and unclamped electro-optic coefficients γ 13 and γ 33 of In 3+ /Er 3+ -codoped LiNbO 3 crystals, which were grown by Czochralski method from the melts containing 0.5 mol% Er 2 O 3 while varied In 2 O 3 contents of 0.0, 0.5, 1.0 and 1.5 mol%, were measured by Mach-Zehnder interferometry. The results show that In 3+ /Er 3+ codoping does not cause change of γ 13 and γ 33 , and both γ 13 and γ 33 can be regarded as unchanged in the studied In 3+ concentration range of 0–2.6 mol% (in crystal) within the experimental error of 3%. The small doping effect is desired in light of the electro-optic application of the crystal. A qualitative, comprehensible explanation for the small effect is given on the basis of the EO coefficient model of LiNbO 3 and doping effect on the defect structure of LiNbO 3 . [ABSTRACT FROM AUTHOR]

Highlights • A mistake in previous paper Opt. Laser Technol. 88 (2017) 152–156] is corrected. • γ 33 and γ 13 were measured by two voltage-applying schemes: Schemes One and Two. • In the Scheme Two, a DC voltage is applied via Al films on crystal surfaces. • γ 33 and γ 13 measured by the Scheme Two are unclamped instead of clamped. Abstract We correct a mistake in the previous paper "Electro-optic properties of indium/erbium-codoped lithium niobate crystal for integrated optics" [Opt. Laser Technol. 88 (2017) 152–156]. The electro-optic coefficients γ 33 and γ 13 that were measured by applying a DC voltage to the crystal via the Al films coated onto the crystal surfaces are the unclamped instead of clamped coefficients. [ABSTRACT FROM AUTHOR]