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. 2000 Aug 15;25(16):1153-5.
doi: 10.1364/ol.25.001153.

Bragg gratings in ternary SiO(2):SnO(2):Na(2)O optical glass fibers

G Brambilla, V Pruneri, L Reekie, C Contardi, D Milanese, M Ferraris

Bragg gratings in ternary SiO(2):SnO(2):Na(2)O optical glass fibers

G Brambilla et al. Opt Lett. .

Abstract

Bragg gratings have been written in an optical fiber with a core made from ternary SiO(2): SnO(2): Na(2)O glass and a SiO(2) cladding. The presence of Na(2)O allows for higher concentrations of SnO>(2) , which are believed to be responsible for the photorefractive response of this composition. In these preliminary experiments significant refractive-index modulations, up to 6.2x10(-4) , have been achieved with a 248-nm excimer laser and a phase mask to write gratings for reflectivity at ~1.5microm . The induced refractive-index changes show enhanced temperature stability, and there is no sign of any erasure up to temperatures exceeding 600 degrees C.

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