Accurate measurement of electro-optic coefficients of undoped and MgO-doped stoichiometric LiNbO_3

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We accurately measure the electro-optic (EO) coefficients of undoped and 1.7 mol% MgO-doped stoichiometric LiNbO3 (SLN) using high-quality crystals and a reliable AC-field applying method. The EO coefficients at the wavelength of 633 nm are determined to be r33 = 30.2 ± 0.6 pm/V and r13 = 9.1 ± 0.2 pm/V for undoped SLN, and r33 = 29.8 ± 0.2 pm/V and r13 = 9.1 ± 0.04 pm/V for MgO-doped SLN. The obtained values are found to be nearly the same with those for congruent LiNbO3.

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