Abstract

We have applied the theory of McCumber to the 44I13/24I15/2 transition of Er3+-doped glasses and confirmed its ability to provide both spectra and accurate values of cross sections. For an Al/P–silica fiber, the exact McCumber treatment is within 3% of the measured emission cross section, whereas an Einstein analysis is off by >50%. An approximate treatment that eliminates the McCumber theory’s requirement of detailed electronic structure has been developed and found to usually provide more accurate values than an Einstein analysis.

© 1991 Optical Society of America

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