Gamma-ray radiation effects on hydroxyl absorption increase in optical fibers

This paper presents gamma-ray irradiation effects on OH-loss increase due to the chemical reaction of H
2
for GeO
2
-doped and GeO
2
. P
2
O
5
-doped fibers. When H
2
diffuses into irradiated fibers (γ-H
2
treatment), OH-loss increase occurs even at room temperature. Moreover, OH-loss increases due to dissolved H
2
in irradiated fibers are larger than those in unirradiated fibers at high temperatures. These OH-loss increases are attributed to irradiation-induced defects with which H
2
reacts to form OH ions. When H
2
-dissolved fibers are irradiated, the OH-loss increases are larger than those in the γ-H
2
-treated fibers at room temperature. These larger loss increases are thought to be caused by the reaction of the unstable radical and dissolved H
2
, which are excited by the irradiation.