Author/Authors :
Huang، نويسنده , , Wentao and Wang، نويسنده , , Shufeng and Yang، نويسنده , , Hong Ying Gong، نويسنده , , Qihuang and Zhan، نويسنده , , Xiaowei and Liu، نويسنده , , Yunqi and Zhu، نويسنده , , Daoben، نويسنده ,
Abstract :
A femtosecond time-resolved optical Kerr gate method, using 115 fs laser pulses at 830 nm, has been applied to investigate the third-order nonlinearity of two novel copolymers containing fluorene and tetraphenyldiaminobiphenyl units in their backbones. Ultrafast off-resonant optical Kerr responses have been observed and the magnitude of the second-order hyperpolarizability was measured as large as 10−30 esu. The origin of the extraordinary large value was explored and compared to other organic materials.
