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Multidimensional coherent pulse addition of ultrashort laser pulses

: Kienel, Marco; Müller, Michael; Klenke, Arno; Eidam, Tino; Limpert, Jens; Tünnermann, Andreas


Optics Letters 40 (2015), Nr.4, S.522-525
ISSN: 0146-9592
Fraunhofer IOF ()
electromagnetic pulse; ultrafast lasers; coherent addition; multidimensional schemes; proof-of-principle experiments; pulse amplification; scalable architectures; step-index fibers; system efficiency; ultrafast laser systems

Spatially 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.