Femtosecond Yb fiber lasers

Passively mode-locked ultrafast ytterbium fiber lasers operating in the wavelength range around 1 mum are subject of intensive investigations during the past years owing to their great potential of realizing cost-effective and compact set-ups [1]. Particularly all-fiber based laser systems are highly suited for the development of reliable, alignment free and low noise laser sources [2]. In this contribution, we will report on two different approaches of providing those ultrafast fiber lasers. A first one is based on a dispersion managed cavity by using a higherorder-mode fiber (HOMF) [3] and the second one consists of an all-normal dispersion fiber oscillator applying spectral filtering for pulse stabilization [4].