Mykola Shopa - Publikacje - MOST Wiedzy

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Rok 2023
  • Optical rotation in the lithium triborate nonlinear crystal
    Publikacja

    - Journal of Applied Crystallography - Rok 2023

    A dual-wavelength polarimetric technique at 633 and 661 nm has been used for the characterization of a nonlinear lithium triborate (LiB3O5) nonenantiomorphous biaxial crystal. The mismatch of the crystallographic and optical coordinate systems was taken into account. The optical rotatory power for light propagation along one of the optical axes is ρ = 7.06° mm−1. The gyration tensor component along the bisector between the x and...

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Rok 2022
  • Imaging polarimeter with high-accuracy measuring principles in crystal optics
    Publikacja

    - OPTO-ELECTRONICS REVIEW - Rok 2022

    An imaging polarimeter based on the principles of high-accuracy polarimetry well known in crystal optics is proposed. The application of scientific digital cameras for performance light measurements leads to precise data on polarizers quality, i.e., maps of extinction ratio and transmission axis. Processing of numerous images, acquired at various settings in the polarizer-sample-analyser system, allows to determine the two-dimensional...

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Rok 2021
  • High-accuracy polarimetric studies on lead germanate single crystals
    Publikacja

    - Journal of Applied Crystallography - Rok 2021

    A high-accuracy polarimetric technique has been used for the characterization of a lead germanate ferroelectric single crystal. The measurement results of the linear and circular birefringence in the [010] direction at a wavelength of 633 nm under the influence of an electric field are presented. Gyration–electric field hysteresis loops at alternative crystal positions in the polarization system have been used to determine the...

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Rok 2020
  • Polarimetric studies of L-arginine-doped potassium dihydrogen phosphate single crystals
    Publikacja
    • M. Shopa
    • Y. Shopa
    • M. Shribak
    • I. Pritula
    • E. Kostenyukova
    • O. Bezkrovnaya

    - Journal of Applied Crystallography - Rok 2020

    Conoscopic interference patterns, channelled spectra and polarimetric techniques have been used for the characterization of pure and doped (with L-arginine amino acid) potassium dihydrogen phosphate (KDP) single crystals. Experimental polarimetric data have been obtained for the frequently used wavelength of 633 nm and for two close wavelengths of 532 and 543 nm in a high-accuracy dual-wavelength polarimeter. The measurement of...

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Rok 2019
Rok 2018
  • Investigations of the optical activity of nonlinear crystals by means of dual-wavelength polarimeter
    Publikacja

    - OPTICAL ENGINEERING - Rok 2018

    A dual-wavelength method in high accuracy polarimetry has been successfully tested and applied to measure optical activity (OA) of nonlinear crystals. In proposed polarimetric scheme two neighboring semiconductor laser wavelengths (635 and 650 nm) are used, which increases number of parameters measured simultaneously and improves the data processing. By neglecting dispersion of eigen wave ellipticity in crystals, more efficient...

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Rok 2017
Rok 2016
  • Calculation methods of interaction of electromagnetic waves with objects of complex geometries
    Publikacja

    - TASK Quarterly - Rok 2016

    Modeling of the electromagnetic interaction with different homogeneous or inhomo-geneous objects is a fundamental and important problem. It is relatively easy to solve Maxwellequations analytically when the scattering object is spherical or cylindrical, for example. How-ever, when it loses these properties all that is left for us is to useapproximation models, to ac-quire the solution we need. Modeling of complex, non-spherical,...

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