Electro-optical properties of Cu:KTa0.57Nb0.43O3 crystal near the FE-PE phase transition region

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2026-06-01 Epub Date: 2026-02-13 DOI:10.1016/j.optmat.2026.117967

Xiaochen Liu , Shenao Wang , Bing Liu , Yuguo Yang , Fudi Chen , Yue Han , Lijie Jin , Jiyang Wang , Xuping Wang

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引用次数: 0

Abstract

Electro-optical (EO) effect has important applications in laser modulation field, such as laser deflector, phase modulator, Q-switch etc, potassium tantalate niobate (KTa_1-xNb_xO₃, KTN) series of crystal is an important multifunctional crystal for its excellent electro-optical, photorefractive, and nonlinear properties. Especially, KTN crystal has the largest quadratic EO coefficient known as reported. However, the EO effect of KTN crystal has a strong temperature dependence, and the pronounced Kerr effect is observed near the Curie temperature. Here, the EO properties, including the linear EO effect and quadratic EO effect, of KTN and Cu-doped KTN crystals were systematically studied near the Curie phase transition region. High-quality KTN and Cu:KTN crystals were grown by the off-center top-seeded solution growth (TSSG) method and the Ta/Nb ratio of the KTN and Cu:KTN crystals are 0.57/0.43. Dielectric temperature spectroscopy measurement indicates that the Curie temperature of the KTa_0.57Nb_0.43O₃ and Cu:KTa_0.57Nb_0.43O₃ crystal are 45.4, 52.3 °C respectively. The KTa_0.57Nb_0.43O₃ and Cu:KTa_0.57Nb_0.43O₃ samples were used to electro-optic measurements after polarization treatment along c-axis of the crystal. KTN and Cu:KTN show both excellent linear EO effect in ferroelectric (FE) state and quadratic EO effect in paraelectric (PE) state. The linear EO effect and quadratic EO effect work together near the FE-PE phase transition region. The half-wave voltages of the KTN and Cu:KTN samples varies between 500V and 50V from 5 °C to 95 °C, which are one to two orders lower of magnitude than conventional electro-optic crystals. This work shows that the Cu:KTN crystal has important application prospects in the laser modulation field.

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FE-PE相变区附近Cu:KTa0.57Nb0.43O3晶体的电光性质

电光效应在激光调制领域有重要的应用，如激光偏转器、相位调制器、q开关等，钽酸铌酸钾（KTa1-xNbxO3， KTN）系列晶体以其优异的电光、光折变和非线性特性成为一种重要的多功能晶体。其中，KTN晶体具有最大的二次EO系数。然而，KTN晶体的EO效应有很强的温度依赖性，在居里温度附近观察到明显的Kerr效应。本文系统地研究了KTN晶体和cu掺杂KTN晶体在居里相变区附近的EO特性，包括线性EO效应和二次EO效应。采用离中心顶种溶液生长法（TSSG）生长出高质量的KTN和Cu:KTN晶体，KTN和Cu:KTN晶体的Ta/Nb比为0.57/0.43。介电温度谱测量表明，KTa0.57Nb0.43O3晶体和Cu:KTa0.57Nb0.43O3晶体的居里温度分别为45.4、52.3 ℃。经晶体c轴极化处理后的KTa0.57Nb0.43O3和Cu:KTa0.57Nb0.43O3样品进行了电光测量。KTN和Cu:KTN在铁电态（FE）和准电态（PE）均表现出良好的线性EO效应。线性EO效应和二次EO效应在FE-PE相变区附近共同作用。KTN和Cu:KTN样品的半波电压在5 °C ~ 95 °C范围内变化在500V ~ 50V之间，比传统电光晶体低一到两个数量级。这表明Cu:KTN晶体在激光调制领域具有重要的应用前景。

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.