Study of Crystal Yb³⁺:Ca₃Y₂(BO₃)₄

Yb³⁺-doped single-crystal Ca₃Y₂(BO₃)₄ with dimension φ20 × 55 mm was grown by the Czochralski method. The structure of it was determined by x-ray diffraction. It belongs to the orthorhombic system, space group Pnma, with the following parameters: a= 7.1690(4), b = 15.4758(8), c = 8.5587(6) Å, V = 949.55(10)ų, M_r = 537.51, Z = 2, D_c = 3.8 g/cm³, (MoKa) = 0.71073 Å, F(000) = 508, μ = 6.927 mm^-1, final R = 0.0670, and wR = 0.1542 for 2975 independent reflections. The structure of Yb:Ca₃Y₂(BO₃)₄ is made up of three set of M-oxygen distorted polyhedrons, and three set of BO₃ planar triangles. Ca²⁺ and Y³⁺ ions occupy three M sites statistically. Yb³⁺ ions substitute Y³⁺ ions to enter these three lattices. The adsorption and emission spectra were measured. It exhibits a broad absorption band ranging from 850 to 1000 nm in the absorption spectrum, which is well matched with the emission wavelength of a laser diode. A broad emission spectrum ranging from 927.95 to 1102.7 nm was observed under the excitation of 895 nm.