Absorption and emission cross sections are measured for the 2 F 5/2 → 2 F 7/2 transition in Yb 3+ ions in silica fibres doped with Al 2 O 3 and P 2 O 5 . The measurements were performed by methods based on spectroscopic data and by more direct methods based on laser-transition saturation. Possible lasing ranges of ytterbium-doped double-clad fibre lasers are calculated from the measured spectral dependences of stimulated transition cross sections.
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Melkumov et al. (2004) studied this question.