Dynamical waveguides are produced via the interband photorefractive effect in a pure KNbO3 crystal by illumination with ultraviolet light. The guiding of a red laser beam is demonstrated. Buildup- and decay times of the waveguides are on the order of a few μS. By reconfiguring the waveguide, different waveguide structures, such as a Y-branch, are easily realized

© 1999 Optical Society of America

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