Dynamics of resonant third‐order optical nonlinearity in perylene tetracarboxylic dianhydride studied by monitoring first‐ and second‐order diffractions in subpicosecond degenerate four‐wave mixing
Dynamics of resonant third‐order optical nonlinearity in perylene tetracarboxylic dianhydride studied by monitoring first‐ and second‐order diffractions in subpicosecond degenerate four‐wave mixing
复制标题
通过监测亚皮秒简并四波混频中的一阶和二阶衍射研究苝四甲酸二酐中的共振三阶光学非线性动力学
DOI：
10.1063/1.457382
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发表时间：
1989
影响因子：
4.4
通讯作者：
P. Prasad
中科院分区：
文献类型：
--
作者：
M. Samoć;P. Prasad
我们提出了一种新的方法，通过同时监测通常相位共轭信号的时间行为和简并四波混频实验中产生的二阶衍射，来获得共振三阶非线性光学过程的动力学信息。二阶衍射被解释为由于激发态光栅的适当傅立叶分量的存在而引起的。在双分子衰变、双光子吸收、吸收饱和和激发扩散等激发态过程的存在下，预计会产生更高的傅里叶分量。利用亚皮秒简并四波混频技术，在602nm波长下研究了有机染料苝四羧酸二酐的三阶非线性光学性质。该染料表现出强烈的非线性共振效应，有效χ(3)为<s:1> 2×10−10 esu。相位共轭信号的衰减与功率有关，可以从理论上解释。
We present a novel approach using simultaneous monitoring of temporal behavior of the usual phase conjugate signal and the second‐order diffraction produced in a degenerate four‐wave mixing experiment to obtain information about dynamics of resonant third‐order nonlinear optical processes. The second‐order diffraction is interpreted as arising from the presence of the appropriate Fourier component of the excited state grating. The higher Fourier components are expected to be generated in the presence of such excited state processes as bimolecular decay, two‐photon absorption, saturation of absorption and diffusion of excitation. Third‐order nonlinear optical properties of an organic dye: perylene tetracarboxylic dianhydride were studied by this approach using subpicosecond degenerate four‐wave mixing at a wavelength of 602 nm. The dye is found to exhibit a strong resonant nonlinear effect with an effective χ(3) of ≊2×10−10 esu. The decay of the phase conjugate signal is power dependent and can be theoreti...