Normalized absorption and fluorescence spectra of .
A two-state crystal field model of (A is the emission from upper level to lower level, B is the absorption from lower level to upper level).
Normalized fluorescence / spectra of in 3 mm thickness glasses: lowly doped FP glass (a), lowly doped tellurite glass (b), lowly doped germanate glass (c), highly doped FP glass (d), highly doped tellurite glass (e), doped high fluorides content FP glass (f).
Normalized fluorescence spectra of lowly and highly doped FP glasses with 3 mm thickness.
and values in 3 mm (a) and 1 mm (b) thickness doped FP glass.
calculated from F-L equation and Reciprocity method with and from this method (1.482/1741 nm) and crystal (1.512/1786 nm) in 1 mm thickness glass.
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