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 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 of 2.7. The beam quality factor is close to the theoretical limit of the 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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