Abstract

A new method for direct writing of localized, circularly symmetric refractive-index changes in optical fibers with a femtosecond laser is demonstrated. The refractive-index changes are characterized using a novel approach employing comparison of numerical simulations to the measured far-field profiles of unmodified and modified fibers. From the analysis, a negative refractive-index change of $-0.015\pm 0.005$ within a radius of $(0.6\pm 0.1)\mathrm{\mu m}$ is determined.

© 2014 Optical Society of America

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