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Refractive-Index profile measurement of large preforms: a now technique

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Abstract

A number of techniques have been developed to measure the refractive- index profile of optical fiber preforms: interferometric,1,2 focusing,3 and spatial filtering4 methods. Among those techniques, the method described in Ref. 5, which traces the deflection angle of a scanning laser beam injected laterally to preform, is widely used in preform characterization.

© 1987 Optical Society of America

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