Erbium-doped silica fibers for intrinsic fiber-optic temperature sensors
- 1 December 1995
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 34 (34) , 8019-8025
- https://doi.org/10.1364/ao.34.008019
Abstract
The variation in the green intensity ratio (2H11/2 and 4S3/2 energy levels to the ground state) of Er ions in silica fibers has been studied as a function of temperature. The different processes that are used to determine the population of these levels are investigated, in particular 800-nm excited-state absorption in Er-doped fibers and 980-nm energy transfer, in Yb–Er-codoped fibers. The invariance of the intensity ratio at a fixed temperature with respect to power, wavelength, and doped fiber length has been investigated and shown to permit the realization of a high-dynamic-range (greater than 600 °C), autocalibrated fiber-optic temperature sensor.Keywords
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