Abstract
Single crystals of new efficient nonlinear optical compounds KTiOPO4 (KTP), RbTiOPO4 (RTP), and TlTiOPO4 (TTP) were grown from molten solutions and some characteristics of their physical properties were investigated. The temperature dependences of the intensity of the second harmonic of laser radiation generated in these crystals and of their permittivities revealed a second-order ferroelectric phase transition at temperatures 934 °C (KTP), 789 °C (RTP), and 581 °C (TTP). Moreover, these crystals exhibited an anomalously high ionic electrical conductivity. The ferroelectricity and the conductivity could affect significantly nonlinear optical characteristics of these crystals.
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