Optical-fiber temperature sensor based on upconversion-excited fluorescence
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Published on: January 7, 2019
Optics Letters
|September 23, 2009
Abstract:
The codoping of a heavy-metal fluoride glass by two rare-earth ions, erbium and ytterbium, permits the semiconductor laser infrared excitation of two visible neighboring fluorescence lines of erbium by upconversion, the intensity ratio of which is a single variable function of temperature.

