In recent years, ytterbium-doped fiber lasers operating at around 1018 nm have attracted considerable interest for their capability to be used as the pump source in multi-kilowatt fiber lasers [1–3]. There are several challenges to realize the high power 1018 nm fiber laser, the most prominent is suppressing the amplified spontaneous emission (ASE) at the range of 1030-1060 nm. In this paper, we report our experimental results of a high power specially-designed amplifier (SDA) at 1018 nm by employing a low core/cladding diameter ratio active fiber of 20/400 µm.

© 2019 IEEE

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