The role of glass composition in the 3D laser fabrication of lithium niobate single crystal in lithium niobosilicate glass
The role of glass composition in the 3D laser fabrication of lithium niobate single crystal in lithium niobosilicate glass
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DOI：
10.1016/j.optmat.2022.112380
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发表时间：
2022-06
影响因子：
3.9
通讯作者：
K. Veenhuizen;Collin Barker;Jacob Franklin;Sean D. McAnany;B. Aitken;Daniel Nolan;V. Dierolf;H. Jain
中科院分区：
文献类型：
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作者：
K. Veenhuizen;Collin Barker;Jacob Franklin;Sean D. McAnany;B. Aitken;Daniel Nolan;V. Dierolf;H. Jain
利用飞秒激光可以在锂镍硅酸盐(LNS)玻璃内部实现LiNbO_3(LiNbO_3)晶体的空间选择性生长，作为光子集成电路中的光学元件。在实际应用中，在LNS玻璃中实现LiNbO_3的连续单晶生长是一项具有挑战性的工作。这项工作通过探索玻璃基质的不一致成分如何影响单晶LiNbO_3的形成来报告在克服这一挑战方面的进展。通过对玻璃成分((100-x)LiNbO_3-x SiO_2，x=0.22，26，30和34)、激光扫描速度和激光功率的参数空间的研究，观察到了几种生长模式：以最佳速度连续生长，在其下方分段生长，以及在其上方生长多晶。对于某些玻璃成分，长孵化时间和高晶体生长速度的平衡导致了以最佳扫描速度生长无限长(∼cm)单晶线的能力。根据LNS成分图，为预测哪些玻璃成分最适合单晶生长提供指导。
Spatially selective growth of lithium niobate (LiNbO3) crystals deep within lithium niobosilicate (LNS) glass can be achieved via femtosecond laser irradiation, wherein these crystals could serve as optical elements in photonic integrated circuits. In practice, it is challenging to achieve continuous, single-crystal growth of LiNbO3within LNS glass. This work reports on progress in overcoming this challenge by exploring how the formation of single-crystal LiNbO3is influenced by the incongruent composition of the glass matrix. An investigation of the parameter space of glass composition ((100 – x) LiNbO3– x SiO2for x = 22, 26, 30, and 34), laser scanning speed, and laser power leads to the observation of several growth modes: continuous growth at an optimal speed, segmented growth below it, and polycrystalline growth above it. For certain glass compositions, a balance of long incubation time and high crystal growth rate results in the ability to grow indefinitely long (∼cm) single crystal lines at the optimal scanning speed. Guidance for predicting which glass compositions are most suitable for single crystal growth based on the LNS composition diagram is provided.