Abstract
Thermal radiation from Y doped and Er doped SiO<sub>2</sub> fibers were studied for the fiber-optic thermometer application in high temperature. Thermal radiation similar to the black body radiation was observed in visible light region from the SiO<sub>2</sub> fibers doped with Y. Visible light radiation peaks due to f-f transitions of rare-earth ions were clearly observed in the Er doped SiO<sub>2</sub> fibers. Intensity ratio of thermal radiation at different wavelength is suitable for the highly sensitive temperature measurement. The hybridization of fluorescent thermometry and thermal radiation thermometry is suggested to extend the temperature range and increase the temperature resolution.
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