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In this paper, we present a comparative study on fiber Bragg gratings fabrication efficiency namely the peak reflectivity and rate of growth in non-hydrogenated boron/germanium co-doped fiber for three writing UV beams (255nm) of spatial coherence width varying from 30% to 100% of the full beam cross-section. All other UV-beam parameters viz. fluence, average power, spot size as well as the phase...
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