Abstract

We report a novel method to increase the UV photosensitivity of GeO<sub>2</sub>: SiO<sub>2</sub> optical fibers based on exposure to CO<sub>2</sub> laser irradiation before grating writing. Fibers treated with a CO<sub>2</sub> laser can produce gratings with refractive-index modulation two times greater and a Bragg wavelength that can be 2 nm longer than those of untreated fibers. Experiments on GeO<sub>2</sub>: SiO<sub>2</sub> preform samples treated with a CO<sub>2</sub> laser in a way similar to the fibers showed a marked increase of the 242-nm absorption band, which is associated with an increase of germanium oxygen-deficient centers and is believed to be responsible for the higher photorefractive response.

© 1999 Optical Society of America

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