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The displacements on the whispering gallery modes (WGM) wavelengths of the three emission bands (660 nm, 760 nm and 1200 nm) of Ho3+ doped yttrium aluminosilicate microspheres were analysed as a function of the temperature. The displacements have been studied in order to evaluate the viability of these microspheres as thermal sensors. A 532 nm continuous wave laser was used to excite and heat the...
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