title: Active radiation hardening of Tm-doped silica fiber based on pump bleaching.
abstract: Tm-doped fiber laser or amplifier can be applied in varied adverse environments. In this work, we demonstrate the pump bleaching of Tm-doped silica fiber with 793nm pump source under gamma-ray irradiation in the range 50Gy-675Gy. The recovery time, the fiber slope efficiency and the fiber cladding absorption spectra after irradiation and bleaching have been measured. It is found that the recovery time and radiation induce absorption are positively associated with doses, however, the fiber slope efficiency of irradiated TDF and bleached TDF are both negatively correlated with doses. Based on the simulation of the fiber core temperature, the probable mechanism of pump bleaching is also discussed.
authors.forename: Ying-bin
authors.initials: YB
authors.lastname: Xing
authors.forename: Nan
authors.initials: N
authors.lastname: Zhao
authors.forename: Lei
authors.initials: L
authors.lastname: Liao
authors.forename: Yi-bo
authors.initials: YB
authors.lastname: Wang
authors.forename: Hai-qing
authors.initials: HQ
authors.lastname: Li
authors.forename: Jing-gang
authors.initials: JG
authors.lastname: Peng
authors.forename: Lv-yun
authors.initials: LY
authors.lastname: Yang
authors.forename: Neng-li
authors.initials: NL
authors.lastname: Dai
authors.forename: Jin-yan
authors.initials: JY
authors.lastname: Li