Abstract

Strong grating formation in pure silica-core fibers by use of 193-nm ArF-laser radiation is reported. Unsaturated refractive-index changes of Δn∼0.3×10-3 were observed in nontreated fiber, and changes of Δn∼0.5×10-3 were observed in fibers with a high hydroxyl concentration. Possible mechanisms of photosensitivity in pure silica-core fibers are discussed.

© 2002 Optical Society of America

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