Abstract

There are two kinds of `step-index' optical fibers with cores made of pure silica glass--high-OH and low-OH content. High-OH fibers are notable for transparency in the UV region of the spectrum and exhibit high radiation resistance while low-OH fibers are applied in IR applications. Decreasing the Cl<SUB>2</SUB>-content in low-OH fibers diminishes the losses in the UV region, which expands the applications for low OH fibers to approximately 300 nm. But the task of fiber production with low OH-content along with transparency in the UV region to 200 nm with high radiation resistance requires a detailed study of the mechanisms of intrinsic and impurity defect formation.

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