Determination and analysis of the linear and second order nonlinear optical properties of Na_2TeW_2O_9

Abstract

The linear and nonlinear optical properties of a new quaternary tungstate tellurite crystal Na2TeW2O9 (NTW) are reported. It transmits well from 0.45 to 5 μm. The refractive indices have been measured and the crystal exhibits flexible phase-matching properties. The complete set of second-order nonlinear optical coefficients were obtained using Maker Fringe techniques, with the largest d13 = 9.3 pm/V. The crystal supports noncritical phase-matching (θ = 90°, φ = ± 48.6°), at the incident wavelength of 1064 nm, the effective nonlinear coefficient (deff) is 6.9 pm/V. The crystal structure and calculations of the dipole moment are discussed to explain the second-harmonic generation of NTW compared with Cs2TeMo3O12. Considering its good linear and nonlinear optical properties, NTW is a good candidate for nonlinear optical applications, especially for 3-5 μm region.