中国物理B ›› 2008, Vol. 17 ›› Issue (7): 2535-2538.doi: 10.1088/1674-1056/17/7/032
田志远1, 姚建年1, 向红2, 王树峰2, 王振伟2, 李智2, 杨宏2, 龚旗煌2
Xiang Hong(向红)a), Tian Zhi-Yuan(田志远)b), Wang Shu-Feng(王树峰)a), Wang Zhen-Wei(王振伟)a), Li Zhi(李智)a), Yang Hong(杨宏)a), Yao Jian-Nian(姚建年)b), and Gong Qi-Huang(龚旗煌)a)†
摘要: This paper investigates the third-order nonlinear optical properties of two azo-nickel chelate compounds by the optical Kerr gate method at 830\,nm wavelength with pulse duration of 120\,fs. Both of the two compounds exhibited large third-order optical nonlinearity. The second-order hyperpolarizability, $\gamma$, of Compound 1 is of $1.0\times 10^{ - 31}$\,esu. Due to the charge transfer, the $\gamma$ of Compound 2 with electron donor and acceptor group is $4.9\times10^{ - 31}$\,esu, which is a four-time enhancement in comparison with Compound 1. The absorption spectra show that the electron push--pull effect, which induces intramolecular charge transfer, leads to the increased optical nonlinearity.
中图分类号: (Optical susceptibility, hyperpolarizability)