title: Large-mode-area Nd-doped single-transversemode dual-wavelength microstructure fiber laser.
abstract: A novel design for a microstructure fiber (MSF) laser consisting of a large core and a single annulus of 5 air holes is described. The fiber design incorporates a silica core that was doped in the liquid phase with 1300 ppm Nd2O3. The light guiding losses in the structurally very simple MSF are approximately 0.7 dB/m. Single transverse mode emission is demonstrated with a mode field area larger than 200 microm2. The laser simultaneously emits at two groups of wavelengths centered at 1060 nm and 1090 nm. Pumped by a cw Ti:sapphire laser, the fiber laser yields a maximum output power of 280 mW (pump power limited) at a slope efficiency of 52%. Our results indicate how the advanced possibilities of MSF's can be used for optimized fiber laser designs.
authors.forename: P
authors.initials: P
authors.lastname: Glas
authors.forename: D
authors.initials: D
authors.lastname: Fischer
authors.forename: M
authors.initials: M
authors.lastname: Moenster
authors.forename: G
authors.initials: G
authors.lastname: Steinmeyer
authors.forename: R
authors.initials: R
authors.lastname: Iliew
authors.forename: C
authors.initials: C
authors.lastname: Etrich
authors.forename: M
authors.initials: M
authors.lastname: Kreitel
authors.forename: L-E
authors.initials: LE
authors.lastname: Nilsson
authors.forename: R
authors.initials: R
authors.lastname: Köppler