Highly efficient high-power thulium-doped germanate glass fiber laser.
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.
Wu
Jianfeng
J
NP Photonics Inc, Tucson, Arizona 85747, USA. jfwu@npphotonics.com
Yao
Zhidong
Z
Zong
Jie
J
Jiang
Shibin
S