Abstract

By measuring the photosensitivity of Ge-doped silica fibers over the 3.4–5.4-eV spectral range and from T=95 K to T=375 K, we demonstrate that different physical mechanisms take place depending on whether H2 is present. Without H2 the principal photosensitivity pathway involves excitation of a germanium oxygen-deficient center to its triplet state. In H2-loaded fibers the UV light excites the regular Ge—O bond, which then reacts with H2 to produce Si—OH or Ge—OH and a GeE center.

© 1999 Optical Society of America

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