Ultrafast non-resonant third-order optical nonlinearity of GeS2-Ga2S3-CdS chalcogenide glass

Ultrafast third-order nonlinear optical responses of 4(1 - x)/5GeS(2)-(1 - x)/5Ga(2)S(3)-xCdS (x = 0.05, 0.10 and 0.15 in mol%) chalcogenide glasses was investigated by using the femtosecond time-resolved optical Kerr effect technique at a wavelength of 800 nm The largest third-order nonlinear susceptibility of all samples was estimated to be 1 65 x 10(-13) esu. An ultrafast nonlinear response time of about 250 fs was observed, which was dominantly assigned to the ultrafast distortion of the electron cloud under femtosecond laser excitation. A nonlinear relationship between the third-order nonlinear susceptibility and the introduced amount of CdS was discussed, suggesting a possible disturbance between different polarizable bonds in the glass system (C) 2010 Elsevier Ltd. All rights reserved