【摘 要】
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This paper investigates the third-order nonlinear optical properties of two azo-nickel chelate compounds by the optical Kerr gate method at 830nm wavelength wit
【机 构】
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State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 10
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This paper investigates the third-order nonlinear optical properties of two azo-nickel chelate compounds by the optical Kerr gate method at 830nm wavelength with pulse duration of 120fs. Both of the two compounds exhibited large third-order optical nonlinearity. The second-order hyperpolarizability, γ, of Compound 1 is of 1.0×10-31 esu. Due to the charge transfer, the γ of Compound 2 with electron donor and acceptor group is 4.9×10-31 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.
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