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Ultraviolet-induced permanent Bragg gratings in cerium-doped ZBLAN glasses or optical fibers

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Abstract

A holographic method was used to write refractive-index gratings in ZBLAN fluoroziroconate glasses or fibers doped by a Ce concentration of 5000 or 10,000 parts-in-106 weight. Direct pumping of the 2F5/2–5d transitions of Ce3+ ions near 245 nm resulted in a change in the refractive index. The photoinduced change partly recovered on a time scale of several hours at room temperature. The remaining change in the refractive index looked stable on a time scale of a month. This permanent change reaches 2 × 10−5 at 1560 nm.

© 1994 Optical Society of America

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