Temperature dependence of the quadratic electrooptic effect and estimation of antipolarization of ADP

Measurements of the temperature dependence of the quadratic electrooptic coefficient |g₁₁₁₁‐g₂₂₁₁| of ADP were made. The coefficient is found to decrease with an increase in temperature. The results show that the intrinsic quadratic electrooptic coefficient |M₁₁₁₁‐M₂₂₁₁| defined in terms of polarization also dependes on temperature. Employing the temperature dependence of |M₁₁₁₁‐M₂₂₁₁| estimation of antipolarization in lowtemperature antiferroelectric phase of ADP is made. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)