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Diffractive coherent combining of a 2.5 kW fiber laser array into a 1.9 kW Gaussian beam

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Abstract

Five 500 W fiber amplifiers were coherently combined using a diffractive optical element combiner, generating a 1.93 kW beam whose M2=1.1 beam quality exceeded that of the inputs. Combining efficiency near 90% at low powers degraded to 79% at full power owing to thermal expansion of the fiber tip array.

©2012 Optical Society of America

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