title: Mode-locked Yb-doped fiber laser emitting broadband pulses at ultralow repetition rates.
abstract: We report on an environmentally stable, Yb-doped, all-normal dispersion, mode-locked fiber laser that is capable of creating broadband pulses with ultralow repetition rates. Specifically, through careful positioning of fiber sections in an all-PM-fiber cavity mode-locked with a nonlinear amplifying loop mirror, we achieve stable pulse trains with repetition rates as low as 506 kHz. The pulses have several nanojules of energy and are compressible down to ultrashort (<500  fs) durations.
authors.forename: Patrick
authors.initials: P
authors.lastname: Bowen
authors.forename: Miro
authors.initials: M
authors.lastname: Erkintalo
authors.forename: Richard
authors.initials: R
authors.lastname: Provo
authors.forename: John D
authors.initials: JD
authors.lastname: Harvey
authors.forename: Neil G R
authors.initials: NG
authors.lastname: Broderick