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The impact of nonlinear refraction and residual absorption on the achievablepeak and average power in beam-splitter-based coherent beam combination isanalyzed theoretically. While the peak power remains limited only by theaperture size, a fundamental average power limit is given by the thermo-opticaland thermo-mechanical properties of the beam splitter material and itscoatings. Based on our analysis, 100 kW average power can be obtained withstate-of-the-art optics at maintained high beam quality (M2 {\leq} 1.1) and atonly 2% loss of combining efficiency. This result indicates that thepower-scaling potential of today's beam-splitter-based coherent beamcombination is far from being depleted. A potential scaling route tomegawatt-level average power is discussed for optimized beam splitter geometry.

The scaling potential of beam-splitter-based coherent beam combination