%0 Journal Article
%T Investigation of third-order nonlinear optical properties of two azo-nickel chelate compounds<br>
%A Xiang Hong
%A Tian Zhi-Yuan
%A Wang Shu-Feng
%A Wang Zhen-Wei
%A Li Zhi
%A Yang Hong
%A Yao Jian-Nian
%A Gong Qi-Huang
%A <br>
%J 中国物理 B
%D 2008
%I 
%X 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.
%K nonlinear optics
%K ultrafast
%K azo chelate<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=CD8D6A6897B9334F09D8D1648C376FB4&aid=5787177F11E6CB43C1C59D288DFA955A&yid=67289AFF6305E306&vid=BCA2697F357F2001&iid=DF92D298D3FF1E6E&sid=AA7F408CF496C2AD&eid=E2B893E3A98DC11A&journal_id=1009-1963&journal_name=中国物理&referenced_num=0&reference_num=0