Challenges of temperature-dependent emission spectra measurement of thulium-doped fibers around 2 µm Bara Švejkarová, Jan Aubrecht, Richard Švejkar, Martin Grábner, W. Andrew Clarkson and Pavel Peterka EPJ Web Conf., 307 (2024) 02017 Published online: 18 October 2024 DOI: 10.1051/epjconf/202430702017