Opt Lett. 2013 Dec 15;38(24):5248-51. doi: 10.1364/OL.38.005248.
In this Letter, we report on the successful fabrication of low loss, high refractive index contrast waveguides via ion migration upon femtosecond laser writing in phosphate glass. Waveguides were produced in two different phosphate glass compositions with high and low La(2)O(3) content. In the La-rich glass, a large refractive index increase in the guiding region was observed due to the incoming migration of La accompanied by the out-diffusion of K. The much smaller refractive index change in the La-less glass is caused by rearrangements of the glass structure. These results confirm the feasibility of adapting the glass composition for enabling the laser writing of high refractive index contrast structures via spatially selective modification of the glass composition.
在这封信件中，我们报告了通过飞秒激光写入在磷酸盐玻璃中进行离子迁移成功制造低损耗、高折射率对比度波导的情况。波导是在两种不同的磷酸盐玻璃组成中制作的，其中一种含有高浓度的 La(2)O(3)，另一种则含有低浓度的 La(2)O(3)。在富含 La 的玻璃中，由于 La 的向内迁移以及 K 的向外扩散，导致导光区的折射率大幅增加。而在 La 较少的玻璃中，折射率的变化则要小得多，这是由于玻璃结构的重新排列所致。这些结果证实了通过对玻璃成分进行空间选择性改性来实现高折射率对比度结构的激光写入，从而适应玻璃成分的可行性。
