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

✍ Scribed by Yanan Hou; Qiming Liu; Hui Zhou; Chang Gao; Shixiong Qian; Xiujian Zhao

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 316 KB
• Volume: 150
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/j.ssc.2010.02.001

✦ Synopsis

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 × 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.