Bulk Growth and Characterization of a Novel Nonlinear Optical Crystal BaTeMo₂O₉

A new nonlinear optical crystal BaTeMo 2 O 9 was grown from the TeO 2 −MoO 3 flux system with sufficient size (30 × 23 × 18 mm 3 ) and optical quality that allowed the characterization of its properties. It crystallizes in the noncentrosymmetrical system, space group P 2 1 (no. 4), with a = 5.5346 Å, b = 7.4562 Å, c = 8.8342 Å, and β = 90.897°. The as-grown BaTeMo 2 O 9 crystal has well-developed faces with the major forms {100}, {001}, {011}, and {011̅}. The transmission spectra results suggest that it can transmit well from 0.5 to 5.0 µm. The refractive indices were also measured. The smaller refractive indices n x and n y are in the ac -plane, and the largest refractive index n z polarization direction is parallel to the crystallographic b -axis.