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- W1992374985 abstract "The approximate McCumber procedure is often used to predict the emission cross-section spectrum of the 1.5-/spl mu/m transition of Er-doped glass fibers from the transition's measured absorption spectrum. By applying this procedure to a large number of published Er-doped fiber absorption spectra, we demonstrate that its accuracy is actually statistically quite low: it tends to overestimate the peak cross-section (by up to 75%) and predicts an emission spectrum that is erroneously depressed in the S band (below /spl sim/1530 nm) and inflated in the C and L bands. Error levels are substantial and yield unacceptably large errors when modeling Er-doped fiber devices. We provide analytic evidence that this failure is rooted in part in the approximations inherent to the procedure, and in part in a fundamental limitation of the underlying McCumber relation. Specifically, when applied to broad optical transitions, the McCumber relation yields poor predictions of the emission cross-section spectral shape, the error worsening in the L and S bands, with increasing homogeneous broadening, and with increasing bandwidth. The McCumber relation should be avoided for broad laser transitions, which includes most rare-earth transitions in many amorphous hosts." @default.
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- W1992374985 date "2002-12-01" @default.
- W1992374985 modified "2023-10-14" @default.
- W1992374985 title "Fundamental limitations of the McCumber relation applied to Er-doped silica and other amorphous-host lasers" @default.
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- W1992374985 doi "https://doi.org/10.1109/jqe.2002.805111" @default.
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