Opt Lett. 2018 Jun 1;43(11):2523-2526. doi: 10.1364/OL.43.002523.
The design and performance of borate glass samples compositionally pre-designed to be femtosecond laser writable via laser-induced ion migration is reported in this Letter. It is demonstrated that borate glasses modified on purpose with small amounts of LaO and NaO can be straightforwardly used to produce high-index contrast (Δn) waveguides by femtosecond-laser-assisted ion migration. The positive Δn of the waveguides is caused by the local enrichment of LaO in the guiding region with a slope of 8·10(mol.%). The value of this is consistent with numerical aperture measurements of the waveguides and local compositional measurements at the guiding region performed by energy-dispersive x-ray micro-analysis. The maximum achievable Δn values can be controlled through the initial LaO content of the glass. Maximum Δn values >10 for samples with just 5.5 mol. % of LaO have been produced. This compositional design approach could be potentially used to produce highly efficient femtosecond laser writeable glasses in other glass families.
本通信报道了一种硼酸盐玻璃样品的设计和性能，这些样品在组成上预先设计为可通过飞秒激光诱导离子迁移进行写入。结果表明，用少量 LaO 和 NaO 改性的硼酸盐玻璃可以通过飞秒激光辅助离子迁移直接用于制作高折射率对比度（Δn）波导。波导的正Δn是由引导区域中 LaO 的局部富集引起的，斜率为 8·10（mol.％）。该值与波导的数值孔径测量和通过能量色散 X 射线微分析在引导区域进行的局部组成测量一致。通过玻璃的初始 LaO 含量可以控制可达到的最大Δn 值。已经生产出具有 5.5 mol.％ LaO 的样品的最大Δn 值>10。这种组成设计方法可用于在其他玻璃族中生产高效的飞秒激光可写入玻璃。
