Dresden 2014 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 2: Optical and nonlinear optical properties, photonic
DF 2.6: Vortrag
Montag, 31. März 2014, 12:10–12:30, GER 37
Vibrational properties and directional dispersion of KTP — •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
Potassium titanyl phosphate (KTP) is a commonly used ferroelectric material with outstanding characteristics for applications in integrated optics. These properties include large electro-optical coefficients, high nonlinear coefficients and high damage threshold compared to other ferroelectrics. Particularly the spontaneous polarization enables the fabrication of periodically poled KTP (PPKTP) in order to achieve highly efficient frequency conversion processes by quasi phase-matching.
Although the material is commercially available a better understanding of its properties is inevitable for further advancement application of KTP. In this work polarization-dependent µ-Raman-spectroscopy has been applied in order to study the vibrational properties of KTP.
Furthermore the directional dispersion of the phonon modes has been recorded.
Our measurements concur well with previous work on KTP. In detail we have assigned the most intense Raman-bands with fundamental vibrations in octahedral and tetrahedral molecules.