Abstract
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 and can be straightforwardly used to produce high-index contrast () waveguides by femtosecond-laser-assisted ion migration. The positive of the waveguides is caused by the local enrichment of in the guiding region with a slope of . 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 values can be controlled through the initial content of the glass. Maximum values for samples with just 5.5 mol. % of have been produced. This compositional design approach could be potentially used to produce highly efficient femtosecond laser writeable glasses in other glass families.
© 2018 Optical Society of America
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