Photosensitivity in Ce3+-doped optical fibres
Dong, L., Wells, P.J., Hand, D.P. and Payne, D.N. (1993) Photosensitivity in Ce3+-doped optical fibres. Journal of the Optical Society of America B, 10, (1), 89-93. (doi:10.1364/JOSAB.10.000089).
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A UV-induced absorption change has been studied in Ce3+-doped preforms and fibers made by a solution-doping modified-chemical-vapor-deposition technique. A reduction in the Ce3+- concentration and the creation of a broad absorption band extending from the UV to the IR were seen on UV exposure. In addition, a peak in the absorption band is created at 245 nm, attributed to Ce4+. The reduction in Ce3+- concentration was observed to remain for at least 3 months, whereas the created broad absorption bands at 632.8 nm recovered by 90% in 2h. Large UV-induced refractive-index changes (10^-4) in Ce3+-doped fibers are also demonstrated. A linear dependence on the average UV intensity is found below 4 kW/m^2, above which saturation occurs. The index change also increases with increasing Ce3+ concentration, again saturating at high levels. A decrease in magnitude with increasing wavelength is observed, but the index change at 1.33µm is still more than 50% of that at 0.5µm, demonstrating the potential of the technique for producing gratings with optical communication applications.
|Subjects:||Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
|Divisions:||University Structure - Pre August 2011 > Optoelectronics Research Centre
|Date Deposited:||11 Mar 2010|
|Last Modified:||27 Sep 2012 11:08|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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