Strong grating formation in pure silica-core fibers by use of 193-nm ArF-laser radiation is reported. Unsaturated refractive-index changes of Dn∼0.3x10(-3) were observed in nontreated fiber, and changes of Dn∼0.5x10(-3) were observed in fibers with a high hydroxyl concentration. Possible mechanisms of photosensitivity in pure silica-core fibers are discussed.

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Journal Optics Letters
Albert, J, Fokine, M., & Margulis, W. (2002). Grating formation in pure silica-core fibers. Optics Letters, 27(10), 809–811. doi:10.1364/OL.27.000809