Abstract

In this paper, we report on a high-power incoherent beam combination of three Tm-doped fiber amplifiers at 1941 nm based on a $3\times 1$ signal combiner. An output power of 790 W is achieved from the signal combiner with a slope efficiency of 52.2% with respect to the launched pump power and a beam quality factor $M^2$ of 2.7. The beam quality factor is close to the theoretical limit of the $3\times 1$ fiber combiner. The parameters of the amplifier are optimized to increase the laser efficiency. Our analyses show that this structure is sufficient to support kilowatt-level output power while maintaining the high beam quality.

© 2018 Optical Society of America

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