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On the base of results from the analysis of known the Judd-Ofelt expression for the line intensities of TR3+ ion spectra, some simple and quite reliable determination methods are given for the luminescent branching ratio connected with the radiative 4F3/2 4IJ transition and the redistribution of the intensities between the bands in the absorption spectra 4I9/2 ∣4f3 [S, L], J〉 of Nd3+ ions in cubic crystals. In these methods intensity parameters Ω4/Ω6 = X are used as the working parameter. This parameter can serve as the convenient characteristics of the “spectroscopic quality” for laser media. Dependences are obtained among the inter-manifold luminescence branching ratios βiΣ(X). The methods proposed are illustrated by the results of the measurements of about twenty crystals doped with Nd3+ ions. [Russian Text Ignored].

An investigation was made of the spectroscopic and laser properties of Nd3+ ions in KY(WO4)2 at 77 and 300°K. An empirical crystal-splitting scheme was deduced for the 4F3/2 and 4I11/2 terms which participate directly in the stimulated emission. The laser transition (~9357 cm−1) was identified. The widths of the luminescence lines were determined. The lifetime of the metastable state was measured and the absorption cross section of the 10.687 A line (~5 10−19 cm2 at 300°K) was deduced.