title: Gamma radiation induced darkening in barium gallo-germanate glass.
abstract: Barium gallo-germanate (BGG) glass is an important glass matrix material used for mid-infrared transmission and mid-infrared fiber laser. In this study, we investigated the γ-ray irradiation induced darkening effect of BGG glass. Optical transmittance spectra, electron paramagnetic resonance (EPR) and thermoluminescence (TL) spectra were employed to investigate the γ-ray irradiation induced defects. Two kinds of Ge-related defects in the irradiated BGG glass, named Ge-related non-bridging oxygen hole center (Ge-NBOHC) and Ge-related electron centers (GEC), were verified. In addition, the absorption bands of the two defects have been separated and the peak absorptivity of Ge-NBOHC and GEC defects is at 375 nm and 315 nm, respectively.
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Chen
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Heng
authors.forename: Guowu
authors.initials: G
authors.lastname: Tang
authors.forename: Tingting
authors.initials: T
authors.lastname: Zhu
authors.forename: Min
authors.initials: M
authors.lastname: Sun
authors.forename: Xiujie
authors.initials: X
authors.lastname: Shan
authors.forename: Xin
authors.initials: X
authors.lastname: Wen
authors.forename: Jingyuan
authors.initials: J
authors.lastname: Guo
authors.forename: Qi
authors.initials: Q
authors.lastname: Qian
authors.forename: Zhongmin
authors.initials: Z
authors.lastname: Yang