Large optical Kerr effect in bulk GeSe 2–In 2Se 3–CsI chalcohalide glasses

Abstract

Third-order nonlinear optical properties of GeSe 2–In 2Se 3–CsI chalcogenide bulk glasses are studied by Standard pico-second (ps) time-resolved optical Kerr effect (OKE) technique. The obtained χ (3) and n 2 at 1064 nm of the glass 72.25GeSe 2–23.75In 2Se 3–5CsI are as large as 10.07 × 10 −12 esu and 6.5 × 10 −18 m 2/W, respectively, more than twice that of As 2S 3 glass. The relationship between glass compositions and the third-order nonlinear optical responses was analyzed by Raman spectra in terms of structural evolution. It is suggested that the tetrahedral units ([GeSe 4] and [InSe 4]) play an important role in the ultrafast third-order nonlinear optical responses of these chalcohalide glasses.