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

IF 0.6 4区材料科学 Q4 CRYSTALLOGRAPHY

Crystallography Reports Pub Date : 2025-05-05 DOI:10.1134/S1063774524602739

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

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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.

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在测量陀螺向单轴晶体透射光谱时，考虑到分光光度法复合光学元件的缺陷。II：样品与光轴平行切割

本文从理论上和实验上研究了偏光片、分析仪和光电倍增管（PMT）的缺陷对平行于光轴切割的langasite族晶体光谱透射依赖性测量结果的影响。结果表明，在没有分析仪的情况下，透射光谱会产生振荡，其振幅与晶体旋转有关。这些振荡与线性双折射有关，并且由于PMT的不完善而发生，它起着部分分析仪的作用。根据得到的光谱计算出与波长相关的PMT参数。计算了所研究晶体的双折射特性，并对计算结果的误差进行了估计。结果表明，光学元件的缺陷不会导致双折射计算的额外误差。因此，当板材与光轴垂直（平行）切割时，圆（线性）双折射表现出来。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Crystallography Reports 化学-晶体学

CiteScore

1.10

自引率

28.60%

发文量

审稿时长

4-8 weeks

期刊介绍： Crystallography Reports is a journal that publishes original articles short communications, and reviews on various aspects of crystallography: diffraction and scattering of X-rays, electrons, and neutrons, determination of crystal structure of inorganic and organic substances, including proteins and other biological substances; UV-VIS and IR spectroscopy; growth, imperfect structure and physical properties of crystals; thin films, liquid crystals, nanomaterials, partially disordered systems, and the methods of studies.