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Abstract
Simultaneous electron paramagnetic resonance (EPR) and optical absorption studies were carried out at room temperature in a Ge-doped silica fiber-optic waveguide following in situ ultraviolet (UV) irradiation with 254-nm (4.88-eV) photons. We have observed that the UV-induced EPR is directly correlated with the UV-induced optical loss in the energy range 1.77–3.0 eV. No UV-induced loss was observed in the near-infrared spectral region (0.7–1.38 eV). The problem of correlating the UV-induced loss with the optical bands of the various possible defect centers in Ge-doped silica is discussed.
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