Berlin 2015 – scientific programme
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DF: Fachverband Dielektrische Festkörper
DF 9: Focused Session on Ferroic Domain Walls III (DF with MA)
DF 9.6: Talk
Tuesday, March 17, 2015, 15:40–16:00, EB 107
Visualization of ferroelectric domain structures in KTP by confocal Raman imaging — •Peter Mackwitz1, Michael Rüsing1, Gerhard Berth1, 2, and Artur Zrenner1, 2 — 1Department Physik, Universität Paderborn, 33098 Paderborn, Germany — 2Center for Optoelectronics and Photonics Paderborn (CeOPP), 33098 Paderborn, Germany
The nonlinear optical material Potassium titanyl phosphate (KTP) unifies several outstanding material properties. Its distinguished features contain a high damage threshold compared with the considerable well known further ferroelectrics, exalted electro-optical coefficients and especially high nonlinear coefficients. The achieving of periodically poled structures in this material represents one of the significant deployments of KTP in integrated optics. Within the common effects of nonlinear implementation frequency conversion is one of the central uses. In order to achieve a highly efficient frequency conversion it is required to supply a nearly ideal surrounding for quasi-phasematching. Periodically poled materials like PPKTP provide this condition. Confocal Raman imaging depicts a noninvasive technique for visualizations of poled structures which is the premise for a characterization. In this work the confocal Raman imaging was achieved in due consideration of different incident polarizations. The measurements were performed as well in y-cut geometry as in z-cut samples. For this purpose numerous phonon modes have been identified as a continuation of previous work. The fundamental result of this work can be outlined as the designation of PPKTP as a proper candidate for domain imaging.