title: Highly efficient high-power thulium-doped germanate glass fiber laser.
abstract: A 64 W fiber laser at 1.9 microm with a slope efficiency of 68% with respect to the launching pump power at 800 nm was demonstrated in a one-end pump configuration using a piece of 20 cm long newly developed thulium-doped germanate glass double-cladding single-mode fiber. A quantum efficiency of 1.8 was achieved. An output laser power of 104 W at 1.9 microm was demonstrated from a piece of 40 cm long fiber with a dual-end pump configuration.
authors.affiliation: NP Photonics Inc, Tucson, Arizona 85747, USA. jfwu@npphotonics.com
authors.forename: Jianfeng
authors.initials: J
authors.lastname: Wu
authors.forename: Zhidong
authors.initials: Z
authors.lastname: Yao
authors.forename: Jie
authors.initials: J
authors.lastname: Zong
authors.forename: Shibin
authors.initials: S
authors.lastname: Jiang