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Chin. Phys. B, 2008, Vol. 17(7): 2535-2538    DOI: 10.1088/1674-1056/17/7/032
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Investigation of third-order nonlinear optical properties of two azo-nickel chelate compounds

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)
a State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China; b Key Laboratory of Photochemistry, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China
Abstract  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.
Keywords:  nonlinear optics      ultrafast      azo chelate  
Received:  08 September 2007      Revised:  07 November 2007      Accepted manuscript online: 
PACS:  42.65.An (Optical susceptibility, hyperpolarizability)  
  42.65.Hw (Phase conjugation; photorefractive and Kerr effects)  
  42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)  
Fund: Project supported by the National Key Basic Research Special Foundation (NKBRSF) of China (Grant No TG1999075207), and the National Natural Science Foundation of China (Grant Nos 10434020, 10521002, 60378012, 90206003, 10328407 and 90101027).

Cite this article: 

Xiang Hong(向红), Tian Zhi-Yuan(田志远), Wang Shu-Feng(王树峰), Wang Zhen-Wei(王振伟), Li Zhi(李智), Yang Hong(杨宏), Yao Jian-Nian(姚建年), and Gong Qi-Huang(龚旗煌) Investigation of third-order nonlinear optical properties of two azo-nickel chelate compounds 2008 Chin. Phys. B 17 2535

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