Product Code: ICAL08_P137

3D-Analysis of Spatial Anisotropy for Linear Electro-optic Effect in Crystal Materials: Geometry Determination of the Most Efficient Electro-Optic Coupling
Authors:
Anatoliy Andrushchak, Lviv Polytechnic National University; Lviv Ukraine
Bohdan Mytsyk, Karpenko Physico-Mechanical Institute; Lviv Ukraine
Andriy Lavinskyy, National Energy Company; Lviv Ukraine
Natalya Demyanyshyn, Karpenko Physico-Mechanical Institute; Lviv Ukraine
Oleg Yurkevych, Lviv Polytechnic National University; Lviv Ukraine
Andriy Kityk, Institute for Computer Science, Department of Electrical Engineering, Czestochowa University of Technology; Czestochowa Poland
Wilfried Schranz, Institut F Experimentalphysik, Universit Wien; Wien Austria
Presented at ICALEO 2008

In this work we have presented the spatial anisotropy 3D-analysis method of the linear electro-optic (EO) effect in crystal materials. The main purpose of such study is to determine the geometry of the most efficient EO coupling. This method is based on the construction and analysis of the indicative surfaces describing the spatial anisotropy of the longitudinal and transverse EO effects. The corresponding equations have been derived and applied to the calculations of the indicative surfaces in pure and MgO-doped LiNbO3 crystals. By means of the indicative surfaces the spatial anisotropy of the EO coupling is evaluated in these crystals. The best optimized cell geometries suitable for the EO applications were determined within the computer simulations based on the optimization procedure. The maximum magnitudes of the linear EO effect are revealed in the longitudinal and transverse geometries of both crystals along the directions which substantially deviates from the principal crystallographic axes. This indeed defines a set of the optimized sample geometries recommended for designers dealing with EO cells. Just by switching from the standard cell geometry to the optimized cell geometry, as determined in present work, one may improve almost three times the modulation efficiency of EO devices based on pure and MgO-doped lithium niobate crystals. This results to corresponding reduction of their driving voltages which evidently is of great practical importance for many applications.
Moreover, using a methodology developed in this work, the optimized geometry can be in principle found for any other crystal materials, including the low symmetry ones.

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