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Abstract <p>The effect of the imperfections of the polarizer, analyzer, and photomultiplier tube (PMT) on the results of measuring the spectral transmission dependences for langasite family crystals cut <i>parallel</i> to the optical axis has been theoretically and experimentally investigated. It is shown that, in the absence of analyzer, oscillations arise on the transmission spectra, whose amplitude depends on the crystal rotation. These oscillations are associated with linear birefringence and occur because of the imperfection of the PMT, which plays the role of a partial analyzer. The PMT parameters in dependence of wavelength are calculated from the obtained spectra. The birefringence of the studied crystals was calculated, and the error of this calculation was estimated. It is shown that the imperfection of optical elements does not lead to any additional errors in the calculation of the birefringence. Thus, when the plate is cut perpendicular (parallel) to the optical axis, circular (linear) birefringence manifests itself.</p>

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Allowance for the Imperfection of the Spectrophotometric Complex Optical Elements When Measuring Transmission Spectra of Gyrotropic Uniaxial Crystals. II: Samples Are Cut Parallel to the Optical Axis

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • T. G. Golovina,
  • A. F. Konstantinova,
  • E. V. Zabelina,
  • N. S. Kozlova,
  • V. M. Kasimova

摘要

Abstract

The effect of the imperfections of the polarizer, analyzer, and photomultiplier tube (PMT) on the results of measuring the spectral transmission dependences for langasite family crystals cut parallel to the optical axis has been theoretically and experimentally investigated. It is shown that, in the absence of analyzer, oscillations arise on the transmission spectra, whose amplitude depends on the crystal rotation. These oscillations are associated with linear birefringence and occur because of the imperfection of the PMT, which plays the role of a partial analyzer. The PMT parameters in dependence of wavelength are calculated from the obtained spectra. The birefringence of the studied crystals was calculated, and the error of this calculation was estimated. It is shown that the imperfection of optical elements does not lead to any additional errors in the calculation of the birefringence. Thus, when the plate is cut perpendicular (parallel) to the optical axis, circular (linear) birefringence manifests itself.