Kienel, MarcoMarcoKienelMüller, MichaelMichaelMüllerKlenke, ArnoArnoKlenkeEidam, TinoTinoEidamLimpert, JensJensLimpertTünnermann, AndreasAndreasTünnermann2022-03-042022-03-042015https://publica.fraunhofer.de/handle/publica/23946310.1364/OL.40.000522Spatially and temporally separated amplification and subsequent coherent addition of femtosecond pulses is a promising performance-scaling approach for ultrafast laser systems. Herein we demonstrate for the first time the application of this multidimensional scheme in a scalable architecture. Applying actively controlled divided-pulse amplification producing up to four pulse replicas that are amplified in two ytterbium-doped step-index fibers (6 µmcore), pulse energies far beyond the damage threshold of the single fiber have been achieved. In this proof-of-principle experiment, high system efficiencies are demonstrated at both high pulse energies (i.e., in case of strong saturation) and high accumulated nonlinear phases.deelectromagnetic pulseultrafast laserscoherent additionmultidimensional schemesproof-of-principle experimentspulse amplificationscalable architecturesstep-index fiberssystem efficiencyultrafast laser systems535journal article