title: Efficient photobleaching of 390-nm luminescence in germanosilicate preforms by the third harmonic of a Nd:YAG laser.
abstract: Permanent photobleaching of blue luminescence with a maximum at ~390 nm in Ge-doped fiber preforms by exposure to the third harmonic (354 nm) of a Nd:YAG laser has been observed. The experimental results show that photodestruction of a germanium oxygen-deficient center can occur without photoionization.
authors.forename: E M
authors.initials: EM
authors.lastname: Dianov
authors.forename: D S
authors.initials: DS
authors.lastname: Starodubov