5 October 2009 The two-photon absorption cross-section of ruby and distributed crystal fibre sensing
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Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 75036L (2009); doi: 10.1117/12.835101
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom
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.
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Craig J. Dalzell, Thomas P. J. Han, Ivan S. Ruddock, "The two-photon absorption cross-section of ruby and distributed crystal fibre sensing", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75036L (5 October 2009); doi: 10.1117/12.835101; https://doi.org/10.1117/12.835101
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KEYWORDS
Luminescence

Absorption

Ruby

Photons

Sensors

Crystals

Optical fibers

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