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Bragg gratings written in H2-free and H2-loaded SMF-28 fiber by use of infrared (IR) femtosecond laser radiation with a phase mask have been investigated in terms of their axial and cross-sectional morphology. It was found that Type I-IR and Type II-IR refractive index changes existed simultaneously in a single grating (which is termed a hybrid grating in this paper) written in either H2-free or H...
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