title: 50 fs pulses from an all-normal dispersion erbium fiber oscillator.
abstract: We present a mode-locked, all-normal-dispersion erbium-doped fiber oscillator generating output pulses with broadband spectra covering the range from 1475 to 1620 nm. The oscillator operates at a repetition rate of 109 MHz with output pulse energies of 1.6 nJ. Mode-locked operation is achieved by use of nonlinear polarization evolution in combination with a birefringent filter. The output pulses are dechirped with an external prism compressor to a duration of 50 fs.
authors.affiliation: Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany. n.chichkov@lzh.de
authors.forename: Nikolai B
authors.initials: NB
authors.lastname: Chichkov
authors.forename: Katharina
authors.initials: K
authors.lastname: Hausmann
authors.forename: Dieter
authors.initials: D
authors.lastname: Wandt
authors.forename: Uwe
authors.initials: U
authors.lastname: Morgner
authors.forename: Jörg
authors.initials: J
authors.lastname: Neumann
authors.forename: Dietmar
authors.initials: D
authors.lastname: Kracht