title: All-fiber DFB laser operating at 2.8  μm.
abstract: Single-frequency laser emission from a distributed feedback all-fiber laser operating in the vicinity of 3 μm is demonstrated. The laser cavity was made of a 30 mm long π-phase-shifted fiber Bragg grating inscribed in a heavily erbium-doped fluoride fiber using infrared femtosecond pulses and the dithering phase-mask technique. A maximum CW output power of 12 mW was obtained at 2794.4 nm by using a multimode pumping scheme. The narrow linewidth was characterized to be lower than 20 kHz using a heterodyne technique. This achievement represents a significant step toward the development of active frequency references operating in the mid-infrared.
authors.forename: Martin
authors.initials: M
authors.lastname: Bernier
authors.forename: Vincent
authors.initials: V
authors.lastname: Michaud-Belleau
authors.forename: Simon
authors.initials: S
authors.lastname: Levasseur
authors.forename: Vincent
authors.initials: V
authors.lastname: Fortin
authors.forename: Jérôme
authors.initials: J
authors.lastname: Genest
authors.forename: Réal
authors.initials: R
authors.lastname: Vallée