Investigation of third-order nonlinear optical properties of two azo-nickel chelate compounds

• 来源期刊: 中国物理B（英文版）
• 关键词: nonlinear optics ultrafast azo chelate
• 年，卷（期）: 2008,（7）
• 页码范围: 2535-2538
• 页数: 4页
• 语种: 英文

摘要

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.