Rare-earth materials doped into low-loss silica fibers are of interest for temperature sensing applications since the absorption properties of such are temperature dependant. Such absorption properties have been studied in ytterbium doped silica fiber using relative absorption and cut-back techniques at temperatures between 77 and 1163 K in the wavelength range 800 to 1150 nm. The wavelength dependant thermal sensitivity varies from -0.012 to 0.033 dB/K for a standardized one meter long 1000 ppm-doped fiber. These significant changes in absorption with temperature have been attributed to homogeneous line broadening. The fibers investigated show excellent potential for use as the sensing element in intrinsic fiber-optic high-temperture sensors.

Date Published: 25 September 1995
PDF: 4 pages
Proc. SPIE 2510, Fiber Optic and Laser Sensors XIII, (25 September 1995); doi: 10.1117/12.221711

Published in SPIE Proceedings Vol. 2510:
Fiber Optic and Laser Sensors XIII
Ramon P. DePaula; John W. Berthold III, Editor(s)