Abstract
Frozen-in mechanical stresses can significantly influence the optical
and mechanical properties of optical fibers, especially in laser fibers for
high-power operation. In the following, we will report on the polarimetric
measurement of stresses induced by the spatially varying doping composition
in fiber preforms. We investigated the effect of rare-earth laser ions and
found that the dopant ytterbium generates higher stresses than other common
dopants in lightwave technology such as phosphorus or aluminum. The stress-induced
index change relevant for the guiding properties is derived from the stress
data. Especially in large-mode-area laser fibers with low numerical apertures,
such stresses can significantly modify the index profile and thereby influence
the propagation behavior.
© 2009 IEEE
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