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The stimulated emission cross sections σLof neodymium crystals at the laser wavelengths (1.05 and 1.32 μm) are useful parameters to predict their laser performance. The determination of σLhas traditionally been a delicate experimental task. We describe here a method which relies upon the measurement of the branching ratios of the radiative transitions from the4F3/2doublet to the4I multiplets, and the calibration is provided by an absorption measurement concerning a4I9/2→4F3/2transition. The precise determination of the spectrometer system response over a broad spectral interval is not required. This method also leads to the value of the fluorescence quantum efficiency η of the4F3/2level. It is applied here to potassium-neodymium tetrametaphosphate, KNd P4O12.
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Gueugnon et al. (1980) studied this question.
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