title: High-power Yb-doped multicore ribbon fiber laser.
abstract: A highly elongated double-clad ribbon fiber that comprises a pure-silica inner cladding with transverse dimensions of approximately 1.4 mm by 0.23 mm with a linear array of ten ytterbium-doped cores has been fabricated and operated in a simple laser configuration pumped by two diode stacks. The fiber laser yielded 320 W of output power at a center wavelength of 1045 nm in a combined beam with beam propagation factors of approximately 2 (perpendicular to the array) and approximately 150 (parallel to the array) for 576 W of launched pump power. The slope efficiency with respect to absorbed pump power was 62%. The prospects for further power scaling and improved beam quality and efficiency are discussed.
authors.affiliation: Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK.
authors.forename: L J
authors.initials: LJ
authors.lastname: Cooper
authors.forename: P
authors.initials: P
authors.lastname: Wang
authors.forename: R B
authors.initials: RB
authors.lastname: Williams
authors.forename: J K
authors.initials: JK
authors.lastname: Sahu
authors.forename: W A
authors.initials: WA
authors.lastname: Clarkson
authors.forename: A M
authors.initials: AM
authors.lastname: Scott
authors.forename: D
authors.initials: D
authors.lastname: Jones