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Optical fiber temperature sensor based on the upconversion fluorescence intensity ratio of NaYF4:Er3+ excited by a 1525-nm laser

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Abstract

Remote and accurate temperature measurements in severe environments are of great importance. A 1525-nm wavelength located in the C band of optical fiber communication is used as a pumping light source for ${\rm{NaY}}{{\rm{F}}_4}{:}{\rm{E}}{{\rm{r}}^{3 +}}$ phosphor possessing high upconversion efficiency. The upconversion luminescence characteristics were demonstrated in the temperature range of 160–400 K. Based on the thermal coupling energy level theory, the temperature measurement principle of the fluorescence intensity ratio is analyzed. The energy gap between the ${}^2{{\rm{H}}_{11/2}}$ and ${}^4{{\rm{S}}_{3/2}}$ energy levels of the ${\rm{E}}{{\rm{r}}^{3 +}}$ ions is approximately ${{787}}\;{\rm{c}}{{\rm{m}}^{- 1}}$, which is appropriate for a temperature sensor. The experimental results indicated that its maximum temperature sensitivity was ${0.00335}\;{{\rm{K}}^{- 1}}$. The proposed optical fiber temperature sensor indicates good hysteresis and repeatability and has potential applications in resisting electromagnetic interference and remote temperature sensing.

© 2021 Optical Society of America

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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