Abstract

We showed that decreasing the feedback that comes from the inner reflections of counter-propagating light could suppress the amplified spontaneous emission (ASE) in the output of 1018-nm fiber lasers. With a simulation model to solve the power spectrum of multiple signals, we calculated the values of the feedback required for aimed power scaling. We realized low feedback by modifying the counter-propagating side of the setup, which included a home-made cladding light stripper on a no-core fiber that was angle-cleaved. With that, we demonstrated a 1018-nm monolithic fiber laser producing 506.4 W with ${{1}.58 \mbox{-}}{{\rm{M}}^2}$ beam quality, 84.9% optical–optical efficiency, and 148-pm linewidth. The maximum intensity of the ASE noises was ${\gt}{{50}}\;{\rm{dB}}$ lower than that of the 1018-nm signal, which could allow further power scaling with safety and stability.

© 2020 Optical Society of America

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