Reaction property of diffused H 2 with defect Centers in GeO 2 -doped fiber

This paper presents the reaction property of diffused molecular hydrogen (H 2 ) with irradiation-induced defect centers in a GeO 2 -doped fiber. When H 2 diffuses into an irradiated fiber, an OH loss increases even at room temperature. This loss increase is thought to be caused by chemical reaction between diffused H 2 and irradiation-induced nonbridging oxygen hole centers (NBOHC's). The hydrogen-associated defect centers having 11.9-mT hyperfine structure are formed by chemical reaction between diffused H 2 and irradiation-induced Ge-defect centers. Moreover, the irradiated fiber shows an OH loss increase at high temperatures even after diffused H 2 is removed from the fiber. The hydrogen-associated defect centers are considered to be the hydrogen source for the OH formation.

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