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EPR Characterization of Carbon Coated Fiber

30 November 1989

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An amorphous carbon coated optical fiber has been developed to improve the resistance of the fiber to static fatigue and hydrogen permeation. The carbon coated optical fibers are characterized by electron paramagnetic resonance spectroscopy. Delocalized spins are observed with a g value of 2.002. Intensity measurements as a function of temperature suggest that both conduction electrons and localized spin centers contribute to the spin resonance. The localized spin centers may arise from point defects in the carbon film. The defects appear to be distributed evenly throughout the carbon coating. These sites may serve as channels through which molecules may diffuse to the silica surface. Annealing is shown as one method to remove the defect centers.