title: Solgel-derived photosensitive germanosilicate glass monoliths.
abstract: We demonstrate volume gratings written in solgel-derived, Ge-doped silica monoliths. Glass was fabricated both with and without germanium oxygen deficient center (GODC) defects. The UV absorption and UV-induced index changes of these glasses, with and without hydrogen loading, are reported. The presence of GODC defects greatly enhances the photosensitivity of Ge-doped silica with and without the presence of hydrogen.
authors: A D
authors: AD
authors: Heaney
authors: T
authors: T
authors: Erdogan