Linear and second-order nonlinear optical dielectric behaviors of lithium niobate single crystals at high temperatures

Dielectric properties - linear and second-order nonlinear optical properties - of lithium niobate ferroelectric crystals are quantitatively studied from the crystallographic structures at different temperatures. On the basis of constituent chemical bonds of lithium niobate, the temperature dependent nature of dielectric properties of such crystals has been concluded. Dielectric responses increase with temperature increasing in a wide range from room temperature to the Curie temperature.