Challenges of temperature-dependent emission spectra measurement of thulium-doped fibers around 2 µmBara Švejkarová, Jan Aubrecht, Richard Švejkar, Martin Grábner, W. Andrew Clarkson and Pavel PeterkaEPJ Web Conf., 307 (2024) 02017DOI: https://doi.org/10.1051/epjconf/202430702017