title: 5kW GTWave fiber amplifier directly pumped by commercial 976nm laser diodes.
abstract: With home-made fiber perform and special fiber drawing & coating technique, a new-type of (3 + 1) GTWave fiber theoretically designed for bi-directional pump method, was successfully fabricated and justified of integrating multi-kW pump energy from commercial 976nm laser diodes. This (3 + 1) GTWave fiber amplifier demonstrated uniform absorption of pump light and easy thermal management characteristics along the whole fiber length. This amplifier is capable of simultaneously aggregating 5.19kW pump power at 976nm and finally generating 5.07kW laser output at 1066.5nm with an optical-to-optical efficiency of 74.5%, the first publically-reported multi-kW GTWave fiber directly pumped with commercial 976nm laser diodes to the best of our knowledge. No power roll-over was found at 5kW level and further power scaling can be expected with more pump power. The results indicate that GTWave fiber is a competitive integrated fiber device to collect enough pump energy from low-cost commercial laser diodes for multi-kW fiber laser development.
authors.forename: Huan
authors.initials: H
authors.lastname: Zhan
authors.forename: Qinyong
authors.initials: Q
authors.lastname: Liu
authors.forename: Yuying
authors.initials: Y
authors.lastname: Wang
authors.forename: Weiwei
authors.initials: W
authors.lastname: Ke
authors.forename: Li
authors.initials: L
authors.lastname: Ni
authors.forename: Xiaolong
authors.initials: X
authors.lastname: Wang
authors.forename: Kun
authors.initials: K
authors.lastname: Peng
authors.forename: Cong
authors.initials: C
authors.lastname: Gao
authors.forename: Yuwei
authors.initials: Y
authors.lastname: Li
authors.forename: Honghuan
authors.initials: H
authors.lastname: Lin
authors.forename: Jianjun
authors.initials: J
authors.lastname: Wang
authors.forename: Feng
authors.initials: F
authors.lastname: Jing
authors.forename: Aoxiang
authors.initials: A
authors.lastname: Lin