Search results for: CRYSTALS POLARIMETRY

• Crystals

  Journals

  ISSN: 2073-4352

• High-accuracy polarimetric studies on lead germanate single crystals

  Publication

  • M. Shopa
  • N. Ftomyn
  • Y. Shopa

  - Journal of Applied Crystallography - Year 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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• MOLECULAR CRYSTALS AND LIQUID CRYSTALS

  Journals

  ISSN: 1542-1406 , eISSN: 1563-5287

• Investigations of the optical activity of nonlinear crystals by means of dual-wavelength polarimeter

  Publication

  • M. Shopa
  • N. Ftomyn

  - OPTICAL ENGINEERING - Year 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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• Imaging polarimeter with high-accuracy measuring principles in crystal optics

  Publication

  • M. Shopa
  • S. Kobyakov
  • Y. Shopa

  - OPTO-ELECTRONICS REVIEW - Year 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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• Polarimetric studies of L-arginine-doped potassium dihydrogen phosphate single crystals

  Publication

  • M. Shopa
  • Y. Shopa
  • M. Shribak
  • I. Pritula
  • E. Kostenyukova
  • O. Bezkrovnaya

  - Journal of Applied Crystallography - Year 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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• Dual-wavelength polarimeter application in investigations of the optical activity of a langasite crystal

  Publication

  • M. Shopa
  • N. Ftomyn
  • Y. Shopa

  - JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION - Year 2017

  A method of high accuracy polarimetry, which includes optical activity measurements systematic errors, was realized with dual-wavelength polarimeter for two wavelengths of 635 and 650 nm. Simultaneous measurements with neighboring wavelengths significantly improved the data processing, by increasing the amount of data to eliminate the systematic errors. For langasite crystal La3Ga5SiO14 we measured temperature dependence of the...

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• Crystal growth and the influence of oxygen stoichiometry on electrical resistivity of single crystals

  Publication

  • T. Klimczuk
  • W. Sadowski
  • J. Olchowik
  • E. Walker
  • T. Klimczuk

  - SUPERCONDUCTOR SCIENCE & TECHNOLOGY - Year 1999

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• CRYSTAL GROWTH & DESIGN

  Journals

  ISSN: 1528-7483 , eISSN: 1528-7505

• JOURNAL OF CRYSTAL GROWTH

  Journals

  ISSN: 0022-0248 , eISSN: 1873-5002