Abstract

A directional coupler written in a glass sample by the focused 400-nm output from a 25-fs oscillator is reported. The coupler is single mode; the splitting ratio is 1.9  dB at 633  nm. A refractive-index profile of the waveguide with a magnitude of Δn=4.5×10-3 was retrieved from a near-field mode pattern.

© 2001 Optical Society of America

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