title: Q-switching and efficient harmonic generation from a single-mode LMA photonic bandgap rod fiber laser.
abstract: We demonstrate a Single-Mode (SM) Large-Mode-Area (LMA) ytterbium-doped PCF rod fiber laser with stable and close to diffraction limited beam quality with 110W output power. Distributed-Mode-Filtering (DMF) elements integrated in the cladding of the rod fiber provide a robust spatial mode with a Mode-Field-Diameter (MFD) of 59μm. We further demonstrate high pulse energy Second-Harmonic-Generation (SHG) and Third Harmonic Generation (THG) using a simple Q-switched single-stage rod fiber laser cavity architecture reaching pulse energies up to 1mJ at 515nm and 0.5mJ at 343nm.
authors.affiliation: DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, 2800 Kgs Lyngby, Denmark. malau@fotonik.dtu.dk
authors.forename: Marko
authors.initials: M
authors.lastname: Laurila
authors.forename: Julien
authors.initials: J
authors.lastname: Saby
authors.forename: Thomas T
authors.initials: TT
authors.lastname: Alkeskjold
authors.forename: Lara
authors.initials: L
authors.lastname: Scolari
authors.forename: Benjamin
authors.initials: B
authors.lastname: Cocquelin
authors.forename: Francois
authors.initials: F
authors.lastname: Salin
authors.forename: Jes
authors.initials: J
authors.lastname: Broeng
authors.forename: Jesper
authors.initials: J
authors.lastname: Lægsgaard