Stress-state manipulation in fused silica via femtosecond laser irradiation
Stress-state manipulation in fused silica via femtosecond laser irradiation
复制标题
DOI：
10.1364/optica.3.001285
复制
发表时间：
2016-12-20
期刊：
影响因子：
10.4
通讯作者：
Cheng, Ya
中科院分区：
文献类型：
--
作者：
Bellouard, Yves;Champion, Audrey;Cheng, Ya
控制激光曝光后玻璃中的应力不仅对于光子学应用至关重要，而且对于保持玻璃组件的机械完整性也至关重要。将熔融石英亚表面暴露于飞秒激光脉冲可以引起玻璃结构的永久性和局部改变。在这项工作中，我们提出的证据表明，随着激光脉冲能量的变化，飞秒激光曝光可用于连续调整材料中的应力，从拉伸状态到压缩状态。此外，我们证明这种效应不仅可以在不同激光诱导微结构之间转变时获得，而且可以在低脉冲能量下、在与制造波导特别相关的激光曝光机制中获得。这些结果表明，飞秒激光曝光是一种多功能工具，可完全控制一定体积二氧化硅中的应力分布，开辟新的技术机会，例如通过局部预加载直写无应力波导、直写应力引起的双折射状态或机械增强部件。由光学协会根据知识共享署名 4.0 许可条款发布。
Controlling the stress in glass after laser exposure is of prime importance not only for photonics applications, but also for preserving the mechanical integrity of glass components in general. The sub-surface exposure of fused silica to femtosecond laser pulses can induce a permanent and localized modification to the glass structure. In this work, we present evidence that femtosecond laser exposure can be used to continuously tailor the stress in the material, from a tensile to compressive state, as the laser pulse energy is changed. In addition, we demonstrate that this effect can not only be obtained while transitioning between different laser-induced microstructures, but also at low pulse energy, in the laser exposure regime particularly relevant for fabricating waveguides. These results demonstrate that femtosecond laser exposure is a versatile tool for fully controlling the stress landscape in a volume of silica, opening up new technological opportunities, like for instance, direct write stress-free waveguides, direct-write stress-induced birefringence state or mechanically reinforced parts, by locally preloading it. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.