Abstract
The quadratic electrooptic coefficients g 1111 and g 2211 have been measured interferometrically in ADP at room temperature. In addition, ‖g 1111-g 2211‖ was determined by a dynamic polarimetric technique at the same temperature. Both experiments yield values for g 1111-g 2211 at 21 C and λ = 0.633 μm with an average of (−5.9±0.5)×10−20 m2/V2. An estimate is made, using this value, of the spontaneous antipolarization appearing in the antiferroelectric phase of ADP. This antipolarization is found to be comparable in magnitude with the spontaneous polarizations observed in ferroelectrics belonging to the KDP family of crystals.
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