Abstract
The process of fiber drawing has been found to produce defect centers in optical fibers with a silica core of low OH content (Suprasil W-1), but not in fibers with a silica core of high OH content (Suprasil 1). At least one center gives rise to the drawing-induced optical absorption, which is identical to the 630-nm band created by ionizing radiation in bulk samples of Suprasil W-1. By means of electron-spin-resonance techniques, additional drawing-induced defect centers have been observed; these centers are identical to the radiation-induced oxygen-associated hole centers in bulk fused silica.
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