Abstract
In this work, the neodymium doped double borate single crystals Ln2Ca3B4O12-Nd (Ln=La, Gd, Y) were Czochralsky grown. Their structure, spectroscopic characteristics, and lifetimes were studied. The distribution coefficients of neodymium ions into the borate lattice Ln2Ca3B4O12-Nd (Ln=La, Gd, Y) were determined. They are close to 1 and slightly increase in the series La, Gd, Y in accordance with the change in the melting temperature. Using the Judd–Ofelt method we determined the intensity parameters: Ω2=4.56×10−20 cm2 and 4.59×10−20 cm2; Ω4=7.29×10−20 cm2 and 7.56×10−20 cm2, and Ω6=9.87×10−20 cm2 and 10.76×10−20 cm2 for La2Ca3B4O12-Nd and Gd2Ca3B4O12-Nd, respectively,. The microparameters and selfquenching rate in the La2Ca3B4O12-Nd and Gd2Ca3B4O12-Nd crystals were calculated. It was shown that the neodymium selfquenching could be described within the framework of the static model, which, probably, corresponds to the structural properties. The possible application of the studied crystals as active laser media, including also the laser-diode pumped ones was concluded.
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