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Change in Refractive Index of a Borosilicate Glass Fiber Annealed Below the Glass Transformation Temperature
Author(s) -
Kang Seunggu,
Lin Hongy,
Day Delbert E.
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb09026.x
Subject(s) - borosilicate glass , refractive index , materials science , annealing (glass) , glass fiber , composite material , optical fiber , activation energy , all silica fiber , refractive index profile , fiber , glass transition , step index profile , optics , graded index fiber , optoelectronics , chemistry , fiber optic sensor , polymer , physics , organic chemistry
Glass fibers pulled from multihole bushings can have a slight difference in thermal history that causes a distribution in the refractive index that can be narrowed by annealing the fibers. The kinetics for the initial stage change in refractive index for fiber annealed between 300° and 500°C are best described by a second‐order reaction with an activation energy of 120° 17 kj/mol. The improved uniformity in refractive index for annealed fibers is indicated by a decrease in the half‐height width of the optical transmission versus temperature curve for glass fiber immersed in a liquid. The standard deviation in the refractive index of glass fibers with a bimodal distribution in diameter decreases from 8 × 10 ‐4 ≤0.0002 to 4 × 10 ‐4 0.0002 after the fibers are annealed at 400°C for 1 h.