Photoinduced processes in Sn-doped silica fiber preforms

Chiodini, N.; Ghidini, S.; Paleari, A.; Brambilla, G.; Pruneri, V.
December 2000
Applied Physics Letters;12/4/2000, Vol. 77 Issue 23
Academic Journal
Effects induced by KrF ultraviolet excimer laser on Sn-doped silica fiber performs were analyzed by means of optical and electron paramagnetic resonance (EPR) techniques. Bond breaking in substitutional Sn sites was evidenced by the Sn-E[sup ′] EPR signal due to sp[sup 3] unpaired electrons in threefold coordinated Sn sites. Red photoluminescence excited at 633 nm, due to nonbridging-oxygen sites, was also observed after laser exposure. The intensity of this emission did not follow the Sn concentration profile, being observed at the core-cladding interface and in the core center. Birefringence data showed that these effects are accompanied by stress relief in the Sn-doped region. Different structural features of core and cladding were evidenced by micro-Raman measurements and related to the observed photosensitivity. © 2000 American Institute of Physics.


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