Journal
OPTICS LETTERS
Volume 40, Issue 19, Pages 4544-4547Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.40.004544
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Funding
- China Postdoctoral Science Foundation [2014M561342]
- Fundamental Research Funds for the Central Universities
- National Natural Science Foundation of China (NSFC) [61505045]
- Program for Innovation Research of Science in Harbin Institute of Technology [B201415]
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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 D-5(0) to F-7(2) Stark sublevels in Eu3+-doped CaWO4 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) K-1 in the experimental temperature range of 303-573 K. (C) 2015 Optical Society of America
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