title: Design of all-solid leakage channel fibers with large mode area and low bending loss.
abstract: We investigate a novel design for all-solid large mode area (LMA) leakage channel fibers (LCFs) for high-power Yb-doped fiber lasers and amplifiers, based on a single down-doped-silica rod ring surrounding a seven-cell pure-silica core, aiming for effectively single-mode behavior and low bending loss characteristics. Through detailed numerical simulations based on the finite element method (FEM), we find that the proposed all-solid LMA-LCFs, having a seven-cell core and two different sizes of down-doped rods, can achieve sufficient differential mode loss and much lower bending loss, as compared with a previously-reported LCF with a one-cell core and six large down-doped-silica rods.
authors.affiliation: Graduate School of Information Science and Technology, Hokkaido University, Sapporo 060-0814, Japan. ksaitoh@ist.hokudai.ac.jp
authors.forename: Kunimasa
authors.initials: K
authors.lastname: Saitoh
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Tsuchida
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Rosa
authors.forename: Masanori
authors.initials: M
authors.lastname: Koshiba
authors.forename: Federica
authors.initials: F
authors.lastname: Poli
authors.forename: Annamaria
authors.initials: A
authors.lastname: Cucinotta
authors.forename: Stefano
authors.initials: S
authors.lastname: Selleri
authors.forename: Mrinmay
authors.initials: M
authors.lastname: Pal
authors.forename: Mukul
authors.initials: M
authors.lastname: Paul
authors.forename: Debasri
authors.initials: D
authors.lastname: Ghosh
authors.forename: Shyamal
authors.initials: S
authors.lastname: Bhadra