Li₂ZrTeO₆ crystals have been proved as a novel nonlinear optical material with a high laser-damage threshold (>1.3 GW cm⁻²) and wide transparency window. However, investigations of the anisotropic properties of Li₂ZrTeO₆ are impeded by the difficulty of high-quality crystal growth. Here, centimeter-sized and high-quality Li₂ZrTeO₆ crystals were grown by a modified top-seed solution growth method. The full-widths at half-maximum of (20) and (001) wafers are 33 and 36 arcsec, respectively. Based on a large high-quality crystal, the thermal properties including thermal expansion, specific heat and thermal conductivity were studied in detail. Our results show that the Li₂ZrTeO₆ crystal exhibits a moderate anisotropic thermal expansion (α_a/α_c ≈ 5) from 25 to 500 °C. The specific heat is measured to be 0.77 to 0.902 J g⁻¹ K⁻¹ from 25 to 500 °C. The thermal conductivities along the a and c axes are determined to be 4.14 and 4.86 W m⁻¹ K⁻¹, respectively, which are superior to that of molybdenum-tellurite and tungsten-tellurite crystals. The excellent thermal properties are one of the origins of the high laser-damage threshold. In addition, the relationship between the structure and the anisotropic thermal properties is also discussed. The results indicate that the Li₂ZrTeO₆ crystal is a promising candidate for high-energy laser applications.

中文翻译：

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Li2ZrTeO6 非线性光学晶体的优化生长和各向异性特性

Li ₂ ZrTeO ₆晶体已被证明是一种具有高激光损伤阈值（>1.3 GW cm ^-2）和宽透明窗口的新型非线性光学材料。然而，高质量晶体生长的困难阻碍了对 Li ₂ ZrTeO ₆各向异性特性的研究。在这里，厘米大小和高质量的 Li ₂ ZrTeO ₆晶体通过改进的顶部种子溶液生长方法生长。的半高全宽 (20) 和 (001) 晶片分别为 33 和 36 弧秒。以一块优质大晶体为基础，详细研究了热膨胀、比热和热导率等热性能。我们的结果表明，Li ₂ ZrTeO ₆晶体在 25 到 500 °C 之间表现出适度的各向异性热膨胀 ( α _a / α _c ≈ 5)。在25 至 500°C 下测量的比热为 0.77 至 0.902 J g ^-1 K ^-1。沿导热率一个和ç轴被确定为4.14和4.86脉冲W M ^-1 ķ ^-1，分别优于钼-碲酸盐和钨-碲酸盐晶体。优异的热性能是高激光损伤阈值的起源之一。此外，还讨论了结构与各向异性热性能之间的关系。结果表明，Li ₂ ZrTeO ₆晶体是高能激光应用的有希望的候选者。