Large and ultrafast third-order optical nonlinearity of novel copolymers containing fluorene and tetraphenyldiaminobiphenyl units in backbones

Huang WT; Wang SF; Yang H; Gong QH; Zhan XW; Liu YQ; Zhu DB

Chemical Physics Letters, Vol.350, No.1-2, 99-105, 2001

DOI10.1016/S0009-2614(01)01220-9 Export Citation

Large and ultrafast third-order optical nonlinearity of novel copolymers containing fluorene and tetraphenyldiaminobiphenyl units in backbones

Huang WT, Wang SF, Yang H, Gong QH, Zhan XW, Liu YQ, Zhu DB

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.