Dresden 2014 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 2: Optical and nonlinear optical properties, photonic
DF 2.8: Vortrag
Montag, 31. März 2014, 12:50–13:10, GER 37
Determination of the nonlinear susceptibility of LiNbO3-LiTaO3 mixed crystals — •Christopher Buchholz1, Merlin Meise1, Gerhard Berth1,2, Huajin Zhang3, and Artur Zrenner1,2 — 1Department Physik, Universität Paderborn, 33098 Paderborn, Germany — 2Center for Optoelectronics and Photonics Paderborn (CeOPP), 33098 Paderborn, Germany — 3State Key Lab of Crystal Materials, Shandong University, Jinan 250100, China
Varying the composition of mixed crystals allows for the tuning of their specific physical proper-ties. In this context Lithium niobate-tantalate (LNT), one of the simplest ferroelectric mixed crystals, is of particular interest due to its multifunctional characteristics. It shows piezoelectrical, particularly electrooptical and optical nonlinear effects. Furthermore the existence of a com-position with zero birefringence at room temperature is unique in ferroelectric nonlinear-optical materials. In particular we have analyzed the second-order nonlinear optical response for LiNb(1-x)TaxO3 over a wide composition range using nonlinear microscopy. The experimentally determined tensor coefficients of the nonlinear susceptibility for different compositions show a linear behavior. Here each tensor coefficient decreases linearly with increasing Ta content. The observed behavior was compered to theoretical calculations, whereby the measured values and those from literature are in good agreement.