LaNbTe2O8: A mid-infrared nonlinear optical crystal exhibiting strong second harmonic generation effect and notable birefringence

IF 2.5 4区材料科学 Q3 CRYSTALLOGRAPHY

Journal of Crystal Growth Pub Date : 2026-02-01 Epub Date: 2025-11-30 DOI:10.1016/j.jcrysgro.2025.128447

Ziyue Chen, Rukang Li

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引用次数: 0

Abstract

A new lanthanum niobium tellurite LaNbTe₂O₈, with favorable mid-infrared (IR) NLO properties has been obtained by high-temperature solution method using excess amount of TeO₂ as flux. This compound crystallized in the noncentrosymmetric space group Abm2 with unit cell parameters of a = 10.9602(14) Å, b = 7.8406(9) Å, c = 8.1507(9) Å and Z = 4. Its structure features two alternate arranged layers consisting of highly distorted NbO₆ octahedra and LaO₈ polyhedra, and TeO₃ trigonal pyramids with stereoactive lone pairs connect the layers to complete the 3D framework. Notably, the optical measurements revealed that LaNbTe₂O₈ possesses a strong second harmonic generation (SHG) signal of 1.2 × KTP at 1064 nm and a wide transparent range (0.34−5.6 μm), which could cover the full crucial atmospheric window (3–5 μm). Considering its large birefringence of 0.165 as revealed by the calculations, it should be capable of realizing phase matching conditions in a wide range. These properties make LaNbTe₂O₈ a potential candidate as a mid-IR nonlinear optical material.

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LaNbTe2O8：一种中红外非线性光学晶体，具有强二次谐波产生效应和显著的双折射特性

以过量的TeO2为助熔剂，采用高温溶液法制备了具有良好中红外（IR） NLO性能的新型碲铌镧镧te2o8。该化合物在非中心对称空间群Abm2中结晶，晶胞参数为a = 10.9602（14） Å， b = 7.8406(9) Å， c = 8.1507(9) Å， Z = 4。其结构特点是由高度扭曲的NbO6八面体和la8多面体组成的两个交替排列的层，具有立体活性的TeO3三角形金字塔将层连接起来，形成完整的三维框架。值得注意的是，光学测量表明，LaNbTe2O8在1064 nm处具有1.2 × KTP的强二次谐波产生（SHG）信号和宽的透明范围（0.34 ~ 5.6 μm），可以覆盖整个关键大气窗口（3-5 μm）。计算表明，它的双折射大，为0.165，因此应该能够在大范围内实现相位匹配条件。这些特性使LaNbTe2O8成为中红外非线性光学材料的潜在候选材料。

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

Journal of Crystal Growth 化学-晶体学

CiteScore

3.60

自引率

11.10%

发文量

373

审稿时长

65 days

期刊介绍： The journal offers a common reference and publication source for workers engaged in research on the experimental and theoretical aspects of crystal growth and its applications, e.g. in devices. Experimental and theoretical contributions are published in the following fields: theory of nucleation and growth, molecular kinetics and transport phenomena, crystallization in viscous media such as polymers and glasses; crystal growth of metals, minerals, semiconductors, superconductors, magnetics, inorganic, organic and biological substances in bulk or as thin films; molecular beam epitaxy, chemical vapor deposition, growth of III-V and II-VI and other semiconductors; characterization of single crystals by physical and chemical methods; apparatus, instrumentation and techniques for crystal growth, and purification methods; multilayer heterostructures and their characterisation with an emphasis on crystal growth and epitaxial aspects of electronic materials. A special feature of the journal is the periodic inclusion of proceedings of symposia and conferences on relevant aspects of crystal growth.