Abstract

Bragg gratings have been UV written in UV hypersensitized standard fibers through exposure of a phase mask to KrF laser light. On the other hand, UV hypersensitized preform plates and fibers have been postexposed in conditions similar to those used to write the gratings. Vacuum-UV and IR absorption spectroscopy has been carried out with a view of monitoring the kinetics of formation (or bleaching) of defect-associated bands. The fluence per pulse $F_i$ was the parameter of the exposures. The dependence of the refractive index changes on fluence per pulse points to a two-photon absorption mechanism for Bragg grating inscription. This dependence is correlated to the one for the $\mathrm{Ge}{\mathrm{E}}^{\prime }$ defect and OH species-related absorption bands and discussed within the framework of a two-step model.

© 2006 Optical Society of America

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