title: Fundamental mode operation of a ribbon fiber laser by way of volume Bragg gratings.
abstract: Selection of the fundamental mode of an active large mode area "ribbon" fiber laser with core dimensions of 107.8 μm by 8.3 μm was produced by a transmitting Bragg grating (TBG) in a free-space resonator. The multimode performance of the original laser was characterized to have an M2 of 11.3 with an absorbed power slope efficiency of 76%. With the TBG aligned to provide maximum diffraction efficiency for the fundamental mode, the M2 improved to 1.45 at an absorbed power slope efficiency of 54% and enhanced the brightness by 5.1 times.
authors.forename: B
authors.initials: B
authors.lastname: Anderson
authors.forename: G
authors.initials: G
authors.lastname: Venus
authors.forename: D
authors.initials: D
authors.lastname: Ott
authors.forename: I
authors.initials: I
authors.lastname: Divliansky
authors.forename: J W
authors.initials: JW
authors.lastname: Dawson
authors.forename: D R
authors.initials: DR
authors.lastname: Drachenberg
authors.forename: M J
authors.initials: MJ
authors.lastname: Messerly
authors.forename: P H
authors.initials: PH
authors.lastname: Pax
authors.forename: J B
authors.initials: JB
authors.lastname: Tassano
authors.forename: L B
authors.initials: LB
authors.lastname: Glebov