Valley-to-peak intensity ratio thermometry based on the red upconversion emission of Er 3

Upon 976 nm diode laser excitation, the temperature dependence of the red upconversion emission of Er in CaWO :Yb /Er phosphor was studied from 298 to 478 K. The spectrum was verified to consist of two Stark components originating from two Stark sublevels of F excited state to I ground state of Er ....

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Bibliographic Details
Published in:Optics express 2016-06, Vol.24 (12), p.13244
Main Authors: Li, Leipeng, Xu, Wei, Zheng, Longjiang, Qin, Feng, Zhou, Yuan, Liang, Zhang, Zhang, Zhiguo, Cao, Wenwu
Format: Article
Language:English
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Summary:Upon 976 nm diode laser excitation, the temperature dependence of the red upconversion emission of Er in CaWO :Yb /Er phosphor was studied from 298 to 478 K. The spectrum was verified to consist of two Stark components originating from two Stark sublevels of F excited state to I ground state of Er . The valley-to-peak intensity ratio (VPR) of this double-peak spectrum was found to increase linearly with the rise of temperature. The maximum relative sensitivity of this VPR method was obtained to be about 0.20% K at 298 K. Moreover, a study on the power dependence was also performed, suggesting that VPR method is immune to the pump power and is thus suitable for monitoring the temperature.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.24.013244