title: Stable sub-85 fs passively mode-locked Erbiumfiber oscillator with tunable repetition rate.
abstract: We present a sub-85 fs self-starting stretched-pulse passively mode-locked Erbium-fiber oscillator in a sigma setup with tunable repetition rate. The sigma cavity included a movable mirror enabling a tunable pulse repetition rate variation of +/- 1 % from 55.3 MHz to 56.4 MHz with continuous, uninterrupted mode-locked operation and an output power around 14 mW. Based on the wide tuning range of the repetition rate the presented fiber oscillator is a suitable candidate for applications in femtosecond spectroscopy or precision metrology around 1.56 microm.
authors.forename: Holger
authors.initials: H
authors.lastname: Hundertmark
authors.forename: Dietmar
authors.initials: D
authors.lastname: Kracht
authors.forename: Martin
authors.initials: M
authors.lastname: Engelbrecht
authors.forename: Dieter
authors.initials: D
authors.lastname: Wandt
authors.forename: Carsten
authors.initials: C
authors.lastname: Fallnich