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In this work we analyze the power scaling potential of amplifying multicorefibers (MCFs) used in coherently-combined systems. In particular, in this studywe exemplarily consider rod-type MCFs with 2x2 up to 10x10 Ytterbium dopedcores arranged in a squared pattern. We will show that, even though increasingthe number of active cores will lead to higher output powers, particularattention has to be paid to arising thermal effects, which potentially degradethe performance of these systems. Additionally, we analyze the influence of thecore dimensions on the extractable and combinable output power and pulseenergy. This includes a detailed study on the thermal effects that influencethe propagating transverse modes and, in turn, the amplification efficiency,the combining efficiency, the onset of nonlinear effect, as well as differencesin the optical path lengths between the cores. Considering all these effectsunder rather extreme conditions, the study predicts that average output powershigher than 10 kW from a single 1 m long Ytterbium-doped MCF are feasible andfemtosecond pulses with energies higher than 400 mJ can be extracted andefficiently recombined in a filled-aperture scheme.

Impact of thermo-optical effects in coherently-combined multicore fiber amplifiers