Promising Material for Infrared Nonlinear Optics: NaI3O8 Salt Containing an Octaoxotriiodate(V) Anion Formed from Condensation of IO3− Ions

Off-center: The material NaI3O8 is obtained as millimeter-sized single crystals (see photograph of a single crystal; crystal size: 2×2×5 mm3), and its crystal structure is acentric. It is transparent up to 12.5 μm, thus covering the three atmospheric transparency windows. It generates an intense second-harmonic-generation signal and has a high optical damage threshold.