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 ${\mathrm{La}}_2{\mathrm{O}}_3$ and ${\mathrm{Na}}_2\mathrm{O}$ can be straightforwardly used to produce high-index contrast ($\mathrm{\Delta }n$) waveguides by femtosecond-laser-assisted ion migration. The positive $\mathrm{\Delta }n$ of the waveguides is caused by the local enrichment of ${\mathrm{La}}_2{\mathrm{O}}_3$ in the guiding region with a slope of $8·{10}^{-3}{(\mathrm{mol}.\%)}^{-1}$. 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 $\mathrm{\Delta }n$ values can be controlled through the initial ${\mathrm{La}}_2{\mathrm{O}}_3$ content of the glass. Maximum $\mathrm{\Delta }n$ values $>{10}^{-2}$ for samples with just 5.5 mol. % of ${\mathrm{La}}_2{\mathrm{O}}_3$ have been produced. This compositional design approach could be potentially used to produce highly efficient femtosecond laser writeable glasses in other glass families.

中文翻译：

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飞秒激光写入硼酸盐玻璃中的光子器件，其成分设计为可激光写入

本信中报告了经激光诱导的离子迁移可预先设计成可飞秒激光写入的硼酸盐玻璃样品的设计和性能。证明了用少量的硼酸玻璃故意改性的硼酸盐玻璃。${\mathrm{啦啦}}_{\mathrm{2个}}{\mathrm{Ø}}_3$ 和 ${娜}_{\mathrm{2个}}\mathrm{Ø}$ 可以直接用于产生高指数的对比度（$\mathrm{\Delta }ñ$飞秒激光辅助离子迁移产生的波导。积极的$\mathrm{\Delta }ñ$ 的波导是由局部富集引起的 ${\mathrm{啦啦}}_{\mathrm{2个}}{\mathrm{Ø}}_3$ 在引导区域中，坡度为 $8·{10}^{-3}{（\mathrm{摩尔}。％）}^{-\mathrm{1个}}$。其值与通过能量色散x射线微分析执行的波导的数值孔径测量和在引导区域的局部成分测量相一致。最大可达到$\mathrm{\Delta }ñ$ 值可以通过初始来控制 ${\mathrm{啦啦}}_{\mathrm{2个}}{\mathrm{Ø}}_3$玻璃的含量。最大$\mathrm{\Delta }ñ$ 价值观 $>{10}^{-\mathrm{2个}}$对于仅5.5 mol的样品。％ 的${\mathrm{啦啦}}_{\mathrm{2个}}{\mathrm{Ø}}_3$已经生产了。这种成分设计方法可以潜在地用于生产其他玻璃系列中的高效飞秒激光可写玻璃。