title: Highly efficient 750 W tapered double-clad ytterbium fiber laser.
abstract: The results of theoretical and experimental studies of active tapered double-clad fibers, intending the optimization of its imperative parameters--tapering ratio, longitudinal profile, core/cladding diameters ratio, are presented. Using a refined taper geometry we have demonstrated power scaling of a ytterbium fiber laser pumped by low-brightness, cost-effective laser diodes up to 750 W, with 80% efficiency.
authors.affiliation: Optoelectronics Research Centre, Tampere University of Technology, 33101 Tampere, Finland. valery.filippov@tut.fi
authors.forename: Valery
authors.initials: V
authors.lastname: Filippov
authors.forename: Juho
authors.initials: J
authors.lastname: Kerttula
authors.forename: Yuri
authors.initials: Y
authors.lastname: Chamorovskii
authors.forename: Konstantin
authors.initials: K
authors.lastname: Golant
authors.forename: Oleg G
authors.initials: OG
authors.lastname: Okhotnikov