Steady photo-darkening of thulium alumino-silicate fibers pumped at $1.07\mu m$: Quantitative effect of lanthanum, cerium and thulium

Jean-François Lupi, Manuel Vermillac, Wilfried Blanc +4

By pumping thulium-doped silica-based fibers at 1.07~μm, rapid generation of absorbing centers leads to photo-induced attenuation (PIA). This detrimental effect prevents exploiting…