Modelling strain dependence of fluorescence from doped optical fibres: application to neodymium

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Collins, Stephen F, Farrell, Peter M, Wade, Scott A, Baxter, Gregory W, Simpson, David Allan, Stevenson, Andrew, Grattan, Kenneth and Forsyth, David (2002) Modelling strain dependence of fluorescence from doped optical fibres: application to neodymium. In: OFS 2002 : 15th Optical Fiber Sensors Conference technical digest. IEEE, Piscataway, N.J., pp. 439-442.


At the present time there is much interest in sensors for the simultaneous measurement of temperature and strain. To engineer strain or temperature sensors, based on the fluorescence lifetime or fluorescence intensity ratio techniques, with desirable characteristics requires detailed understanding of the physical origin of the strain dependency of these fluorescence effects. It has been suggested that the cause is slight shifts in the energy levels, since some of the important levels in rare-earth-doped crystals shift when subjected to considerable pressure. However, recent theoretical work analysing the two techniques, and outlined in the next section, does not support this idea. Instead, in that work, it was proposed that this sensitivity is due to a volumetric distortion of the energy transfer rates between the dopant ions. In this model an applied strain results in a slight decrease in concentration. To explore this latter idea, strain and temperature dependencies of Nd3+-doped optical fibres of various concentrations have been analysed using this model. Existing data have been supplemented by new measurements, giving the sensitivities for the two techniques at a number of dopant concentrations.

Item type Book Section
Official URL
ISBN 0780372891
Subjects Historical > Faculty/School/Research Centre/Department > School of Engineering and Science
Historical > FOR Classification > 0299 Other Physical Sciences
Keywords ResPubID: 4993, optical fibers, temperature sensors, fibre Bragg grating, strain dependence, temperature dependence
Citations in Scopus 3 - View on Scopus
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