Abstract
We investigate the use of infrared femtosecond laser pulses to induce highly
localized refractive-index changes in fused-silica glasses. We characterize
the magnitude of the change as a function of exposure and measure index changes
as large as and in pure fused silica and boron-doped silica, respectively. The
potential of this technique for writing three-dimensional photonic structures
in bulk glasses is demonstrated by the fabrication of a Y coupler within a
sample of pure fused silica.
© 1999 Optical Society of America
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