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Proceedings Paper

The two-photon absorption cross-section of ruby and distributed crystal fibre sensing
Author(s): Craig J. Dalzell; Thomas P. J. Han; Ivan S. Ruddock
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Paper Abstract

Distributed sensing of temperature using fluorescence can be achieved by using time-correlated two-photon excitation. To assess the extension of this technique to crystal fibres, the two-photon absorption cross-section of ruby (Cr:sapphire) was measured by comparing the fluorescence yield for two-photon excitation with that for single-photon excitation of the same transition. Its wavelength dependence was determined over the 0.8-1.2μm range with a maximum room temperature value of 5.5 x 10-53cm4.s.ion-1.photon-1 being observed at 840nm for e-polarisation. From room temperature to 400oC, the two-photon absorption cross-sections at 1.06μm showed small increases for linearly polarised light but an increase of ~ 300% for circularly polarised light. The feasibility of a distributed optical fibre temperature sensor based on time-correlated two-photon excited fluorescence in ruby is discussed.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75036L (5 October 2009); doi: 10.1117/12.835101
Show Author Affiliations
Craig J. Dalzell, Univ. of Strathclyde (United Kingdom)
Thomas P. J. Han, Univ. of Strathclyde (United Kingdom)
Ivan S. Ruddock, Univ. of Strathclyde (United Kingdom)

Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors
Julian D. C. Jones, Editor(s)

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