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Luminescence of Eu3+ :Y2O3 Powder Thermally Diffused into an Optical Fiber for Distributed Thermal Sensing

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Abstract

The lifetime, the linewidth and the integrated intensity of emission from lanthanide rare earths ions, substitutionally doped into crystalline hosts is sensitive to changes in the temperature and provides a good basis for thermometry. We have begun development of distributed temperature sensor integrated into an optical fiber using this temperature dependent emission spectra. Eu3+: Y2O3 powder was thermally diffused into an optical fiber; the fiber was placed in an oven, optically pumped, and the resulting luminescence entrained within the fiber was measured as it emerged from the fiber. We report here on a study of the temperature dependent lineshape of the emission at 611 nm which clearly shows a strong and regular dependence on temperature over the range of 300 to 1000 K. We describe the physical characteristics of the Y2O3 crystalline host and the Eu3+ luminescence center. A good fit to the measured temperature dependence of linewidth is obtained using a single phonon model. The strong temperature dependence of the observed linewidth suggests that there may be enhanced emission, which can be explained as the emission from two nearby Stark level transitions.

© 1994 Optical Society of America

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