Intensities of optical transitions in absorption and luminescence spectra of neodymium in glasses

Measurements are reported of the oscillator strengths of the absorption bands of the main glassy matrices and several industrial neodymium-doped laser glasses. The results are analyzed from the point of view of the Judd theory (1962) and represented by three parameters Ω₂, Ω₄, and Ω₆. These parameters are used to calculate the spontaneous emission probabilities and stimulated emission cross sections of the ⁴F_3/2→⁴I_11/2, ⁴I_13/2 transitions. A comparison is made between the values of these quantities and the published data for Nd³⁺-activated crystals, glasses, and solutions.