Spectroscopic characteristics of the Nd3+ ions in garnet crystals

The article deals with the research of oscillator strengths and the Ωt (t=2,4,6) intensity parameters of Nd3+ doped garnet crystals. It has been found that the absorption intensity of the 4I9/2→4G5/2, 2G7/2 hypersensitive transition in the Ca3(NbGa)5O12 crystals doped with Nd3+ is considerably higher than the corresponding values in the following garnet crystals: Y3Al5O12:Nd, (GdY)3(ScAl)5O12:Nd, Gd3(ScAl)5O12:Nd and (GdСa)3(GaZr)5O12:Nd. It has been established also that the Ω2 intensity parameter of the Ca3(NbGa)5O12:Nd crystals is one order of magnitude higher compared to the same parameter for the other garnet crystals. These effects in the Ca3(NbGa)5O12:Nd crystals are explained by the presence of the Nd3+ ions optical sites with a symmetry of local environment C2, C2v, C1.