A new nonlinear optical material Sr2TiSi2O8

Fresnoite type compound Sr 2 TiSi 2 O 8 was found as a new nonlinear optical material. This compound was synthesized by substituting Sr 2+ for Ba 2+ in fresnoite Ba 2 TiSi 2 O 8 . X- ray diffraction data showed Sr 2 TiSi 2 O 8 and fresnoite are isostructural. The second harmonic generation (SHG) effect of Sr 2 TiSi 2 O 8 is about 8 times larger than that of KH 2 PO 4 (KDP). The ultraviolet absorption edge of Sr 2 TiSi 2 O 8 is around 270nm.