Abstract
The so-called photorefractive effect in SiO2/GeO2 waveguide materials1 is initiated by exposure to ultaviolet radiation in the vicinity of 240nm. Absorption changes produced by this exposure contribute to a refractive index change at longer wavelengths, which can have device implications2 e.g., writing Bragg gratings in single-mode fibers for filters.
© 1992 Optical Society of America
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