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4 March 2019 High-index-contrast Bragg gratings fabricated in fluoride fiber with 513-nm femtosecond laser
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Abstract
We report the femtosecond laser inscription of fiber Bragg gratings (FBGs) in an Er-doped fluoride glass fiber used for lasing at a mid-infrared wavelength of 2.8 μm. FBG reflectivity and laser output power are observed with varying the index change of grating plane. We have tried to create high-index-contrast grating planes worked as Bragg reflector. The index change was estimated by fitting experimentally obtained reflectivity to its calculation. When using laser fluences of 25 and 40 J/cm2, the index change was found to be 0.7×10-3 and 1.1×10-3, respectively. When using laser fluence of 25 J/cm2, FBG reflectivity increases up to 95% at the grating length of 4.0 mm. The case of using 40 J/cm2 shows 97% at the grating length of 2.5 mm. These results are in agreement with the reflectivity calculation. The investigation of lasing evolution will contribute to more efficient fabrications of FBG and fiber laser system.
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K. Goya, H. Uehara, D. Konishi, M. Murakami, and S. Tokita "High-index-contrast Bragg gratings fabricated in fluoride fiber with 513-nm femtosecond laser ", Proc. SPIE 10899, Components and Packaging for Laser Systems V, 1089919 (4 March 2019); https://doi.org/10.1117/12.2508362
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