Conception, modelling, and characterization of a fiber amplifier with a simple and easy-to-repair configuration intended for the use in harsh environmentsNaoya Ozawa, Keisuke Nakamura and Yasuhiro SakemiEPJ Techn Instrum, 11 1 (2024) 3DOI: https://doi.org/10.1140/epjti/s40485-024-00111-1