title: 50.4% slope efficiency thulium-doped large-mode-area fiber laser fabricated by powder technology.
abstract: We report on a triple clad large-mode-area Tm-doped fiber laser with 18 μm core diameter manufactured for the first time by an alternative manufacturing process named REPUSIL. This reactive powder sinter material enables similar properties compared to conventional CVD-made fiber lasers, while offering the potential of producing larger and more uniform material. The fiber characterization in a laser configuration provides a slope efficiency of 47.7% at 20°C, and 50.4% at 0°C with 8 W output power, with a laser peak emission at 1970 nm. Finally, a beam quality near the diffraction-limit (M(x,y)2<1.1) is proved.
authors.forename: Dia
authors.initials: D
authors.lastname: Darwich
authors.forename: Romain
authors.initials: R
authors.lastname: Dauliat
authors.forename: Raphaël
authors.initials: R
authors.lastname: Jamier
authors.forename: Aurélien
authors.initials: A
authors.lastname: Benoit
authors.forename: Jean-Louis
authors.initials: JL
authors.lastname: Auguste
authors.forename: Stephan
authors.initials: S
authors.lastname: Grimm
authors.forename: Jens
authors.initials: J
authors.lastname: Kobelke
authors.forename: Anka
authors.initials: A
authors.lastname: Schwuchow
authors.forename: Kay
authors.initials: K
authors.lastname: Schuster
authors.forename: Philippe
authors.initials: P
authors.lastname: Roy
mesh_terms: D007834:Lasers; D055100:Optical Fibers; D011208:Powders; D013932:Thulium
chemical_list: D011208:Powders; D013932:Thulium