Journal
OPTICS EXPRESS
Volume 19, Issue 25, Pages 25792-25798Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.025792
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Funding
- Comision Interministerial de Ciencia y Tecnologia [MAT2010-21270-C04-02]
- Malta Consolider Ingenio [CSD2007-0045]
- FPI of Gobierno de Canarias
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Microspheres of Nd3+ doped barium titano silicate glass were prepared and the whispering gallery mode resonances were observed in a modified confocal microscope. A bulk sample of the same glass was calibrated as temperature sensor by the fluorescence intensity ratio technique. After that, the microsphere was heated by laser irradiation process technique in the microscope and the surface temperature was estimated using the fluorescence intensity ratio. This temperature is correlated with the displacement of the whispering gallery mode peaks, showing an average red-shift of 10 pm/K in a wide range of surface temperatures varying from 300 K to 950K. The limit of resolution in temperature was estimated for the fluorescence intensity ratio and the whispering gallery mode displacement, showing an improvement of an order of magnitude for the second method. (C) 2011 Optical Society of America
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