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The growth, absorption spectra, fluorescence spectra and luminescence decay curves of Tm3+-, Ho3+-BaLaGa3O7 crystals are reported. The 3F4→3H6 and 5I7→5I8 IR transitions of the Tm3+-BaLaGa3O7 and Ho3+-BaLaGa3O7 crystals are broad emission bands at about 2.0 µm; the corresponding stimulated emission cross-sections were calculated by the Fuchtbauer–Ladenburg equation, respectively. Based on the Judd–Ofelt theory, we obtained three intensity parameters and a series of spectral parameters. The energy transfer parameters between the Tm and the Ho were also calculated. These results show that these crystals are promising as tunable infrared laser crystals for the 2.0 µm regions.

The Nd3+-doped Ba3Gd2(BO3)4 crystal with high optical quality and large size is reported in this paper. The growing processes and characteristics of Nd3+:Ba3Gd2(BO3)4 crystal are discussed. The absorption and luminescence spectra of Nd3+ in Ba3Gd2(BO3)4 crystal were measured at room temperature. The luminescence decay curve in correspondence with the 4F3/2 →4I11/2 transition centered at 1062 nm was also measured. The JO intensity parameters Ωt (t = 2,4,6) were calculated to be Ω2 = 1.263, Ω4 = 2.496, Ω6 = 3.606. The radiative lifetime τr and fluorescence lifetime τf are 317.771 and 115 μs respectively, and the fluorescence quantum efficiency is 37.1%.