title: Monolithic all-glass pump combiner scheme for high-power fiber laser systems.
abstract: We report on an integrated all-glass pump combiner for ytterbium-doped high power fiber lasers. The combining of multiple pump fibers with an active double clad fiber for high power amplification was successfully achieved by splicing them to a dichromatically coated planar convex lens. The measured coupling efficiency of such a combining scheme was typically in excess of 80%, with 86.5% achieved in maximum. Theoretical analysis is discussed in order to get optimized parameters and to consider the scaling of this type of coupler to higher average powers.
authors.affiliation: Fraunhofer Institute for Applied Optics and Precision Engineering Beutenberg Campus, Albert-Einstein St. 7, 07745 Jena, Germany.
authors.forename: Jun Ki
authors.initials: JK
authors.lastname: Kim
authors.forename: Christian
authors.initials: C
authors.lastname: Hagemann
authors.forename: Thomas
authors.initials: T
authors.lastname: Schreiber
authors.forename: Thomas
authors.initials: T
authors.lastname: Peschel
authors.forename: Steffen
authors.initials: S
authors.lastname: Böhme
authors.forename: Ramona
authors.initials: R
authors.lastname: Eberhardt
authors.forename: Andreas
authors.initials: A
authors.lastname: Tünnermann