Crystal growth, measurement and modeling of the optical activity of α-GeO2 – Comparison with α-SiO2

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2025-04-09 DOI:10.1016/j.optmat.2025.117042

Alexandra Peña, Corinne Félix, Bertrand Ménaert, Benoît Boulanger

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引用次数: 0

Abstract

This work aimed first at growing high quality bulk α-GeO₂ crystals in their Quartz iso-structural form (α-SiO₂), using a high temperature flux method. By optimizing the flux composition and the geometry and orientation of the seeds, it has been possible to achieve growth yields up to 90 % leading for the first time to bulk single crystals up to 3.5 cm³. Thanks to the optical quality and size of the obtained crystals, the second step of this study was the measurement of the optical activity of α-GeO₂ between 0.3 and 2 μm. This gave access to the value of one of the independent components of the gyration tensor (g₃₃) as a function of the wavelength. An α-SiO₂ slab have been used to validate our methodology. Both crystals show a magnitude of optical activity of 3.4 × 10⁻⁵ rad/μm in the near IR range and great variations where the higher values are 3.4 × 10⁻³ rad/μm and 1.7 × 10⁻³ rad/μm at 0.3 μm for α-GeO₂ and α-SiO₂, respectively. The measurements are perfectly described by an empirical model that we propose and which relies on the macroscopic first-order electrical susceptibility and on the pitch of the structural helix compared to the wavelength of light.

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α-GeO2的晶体生长、光学活性的测量和建模-与α-SiO2的比较

这项工作首先旨在利用高温通量法生长出具有石英等结构形式（α-SiO2）的高质量块状α-GeO2晶体。通过优化助熔剂组成和种子的几何形状和方向，可以实现高达90%的生长产量，从而首次使单晶体积达到3.5 cm3。由于获得的晶体的光学质量和尺寸，本研究的第二步是测量α-GeO2在0.3 ~ 2 μm之间的光学活性。这样就可以得到旋转张量的一个独立分量（g33）作为波长函数的值。用α-SiO2平板验证了我们的方法。α-GeO2和α-SiO2晶体在近红外范围内的光学活度分别为3.4 × 10−5 rad/μm和1.7 × 10−3 rad/μm，两者变化较大，在0.3 μm处的活度分别为3.4 × 10−3 rad/μm和1.7 × 10−3 rad/μm。我们提出的经验模型完美地描述了测量结果，该模型依赖于宏观的一阶电磁化率和结构螺旋相对于光波长的螺距。

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

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.