Browsing by Author "Andrushchak, Anatoliy"

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    Calcium tungstate is a perspective acousto-optic material. Photoelastic properties
    (Видавництво Львівської політехніки, 2010) Mytsyk, Bohdan; Kost’, Yaroslav; Andrushchak, Anatoliy; Solskii, Ivan
    Acousto-optic modulators are main component of communication fibre-optic systems. From the other side the studies of the absolute piezo-optic effect (POE) are one of the important steps to estimate the acousto-optic efficiency of optical materials. In this article the investigation results of POE in calcium tungstate crystals (CaWO4) has been represented. It is also proved that this crystal is essentially better acousto-optic material in comparison with lithium niobate (LiNbO3) widely used in acousto-optic devices.
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    Characterization Technique of Crystalline Materials for Most Efficient Their Application as Active Element of Electro-Optic Cell in Infocommunication Systems
    (Видавництво Львівської політехніки, 2012) Andrushchak, Anatoliy; Yurkevych, Oleh; Kityk, Andriy
    In this work we present the experimental technique suitable for the determination of all the linear electro-optic effect (LEOE) tensor components in crystal materials of any symmetry. We describe in details the sam-ple geometries that are needed to determine a complete set of the LEOE tensor components as well as derive the corresponding equations. It gives a possible to perform the electro-optic characterization for all crystalline materials with aim of most efficient their application as active elements of electrooptic cells for infocommunication systems.
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    New method of extremal surfaces for most efficient application of crystalline materials in electro-optic devices
    (Видавництво Львівської політехніки, 2012) Buryy, Oleg; Ubizskii, Serhij; Andrushchak, Anatoliy
    New method for geometry determination of most efficient application of crystalline materials as active elements of electro-optic devices is proposed. This method is based on the analysis of properties of the extremal surfaces obtained by optimization procedure and consists in the determination of such directions of the electrical field and the wave normal that maximize the path difference for two orthogonally polarized waves, which can propagate along arbitrary direction in investigated crystal. The method of extremal surfaces was approbated in example of LiNbO3 crystal.