Morphology and Thermal Stability of Fiber Bragg Gratings for Sensor Applications Written in H-2-Free and H-2-Loaded Fibers by Femtosecond Laser

[摘要]：Bragg gratings written in H-2-free and H-2-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

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