Potassium tantalate-niobate mixed crystal thin films for applications in nonlinear integrated optics

Photorefractive Photonics 2017

Jia, Yuechen^1 ; Szabados, Jan^1 ; Winkler, Markus^2 ; Breunig, Ingo^1,2 ; Cimalla, Volker^3 ; Kirste, Lutz^3 ; ukauskaite, Agne^3 ; Buse, Karsten^1,2

Laboratory for Optical Systems, IMTEK, University of Freiburg, Georges-Köhler-Allee 102, Freiburg

79110, Germany^1

Fraunhofer Institute for Physical Measurement Techniques IPM, Heidenhofstraße 8, Freiburg

79110, Germany^2

Fraunhofer Institute for Applied Solid State Physics IAF, Tullastraße 72, Freiburg

79108, Germany^3

关键词: Epitaxially grown;    KTN film;    MgO substrate;    Mixed crystals;    Nonlinear integrated optics;    Nonlinear optical devices;    Potassium tantalate niobate;    Thermal annealing treatment;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/867/1/012020/pdf
DOI  :  10.1088/1742-6596/867/1/012020

来源: IOP

【 摘 要 】

Potassium tantalate-niobate mixed crystal (KTN) thin films are promising candidates to meet the needs of integrated nonlinear optical devices for electro-optic and frequency-conversion applications. In this contribution we report on pulsed-laser-deposition growth of ferroelectric KTN films on MgO substrates. It was shown that highly-oriented KTN films are epitaxially grown as revealed by X-ray diffraction analysis. Moreover, the thermal annealing treatment can be further optimized to obtain optically smooth KTN films with RMS surface roughness as low as 1 nm.