Abstract
Here we report on the results of systematic investigation of multiphonon nonradiative relaxation from high-lying levels 4F92, 4G52, 4G72, 4D32 and 2P32 of Nd3+ ion in fluoride matri ces (fluoride glass, LaF3, CaF2, SrF2, YLiF4) and oxide matrices (Gd3Ga5O12, YAlO3, CaMoO4, Y3Al5O12) with a concentration of Nd3+ near 1%. New quantitative data on relaxation rates for some nonradiative transitions were obtained in these laser materials. The energy gap dependence of nonradiative relaxation rate was measured and analyzed in LaF3, YLiF4, Gd3Ga5O12, YAlO3, CaMoO4 and Y3Al5O12 crystals in 1100–2200 cm−1 energy gap region. The slope of energy gap dependencies for fluoride matrices was found to be larger than for oxide matrices. Our experimental data give values of nonradiative relaxation rates in the small energy gap region of 400–2500 cm−1 close to the data obtained from one-phonon broadening of luminescence spectral lines. Also the luminescence spectra for transitions from the 4G7/2, 4D3/2, 2P3/2 levels are presented.
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