Abstract

A thermometry method based on the ratio between the valley intensity formed by fluorescence peak overlap and the peak fluorescence intensity has been developed. Excited by a 405 nm laser, the valley to peak ratio (VPR) of the emissions originating from ${}^5{\mathrm{D}}_0$ to ${}^7{\mathrm{F}}_2$ Stark sublevels in ${\mathrm{Eu}}^{3+}$-doped ${\mathrm{CaWO}}_4$ shows a monotonic change with temperature. Spectrum analysis indicates that this monotonic increase is caused by the homogeneous broadening of the spectral lines as the temperature increases. The relative sensitivity $S_r$ is in the magnitude of ${10}^{-4}{\mathrm{K}}^{-1}$ in the experimental temperature range of 303–573 K.

© 2015 Optical Society of America

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