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采用中心波长800nm、脉宽30fs的超短激光脉冲,通过飞秒光开关技术(Optical Kerr Shutter,OKS)对富勒烯有机-无机杂化材料的飞秒超快非线性特性进行了实验研究.获得270fs的开关时间,所得的富勒烯有机-无机杂化材料的三阶非线性系数χ(3)约为4.5×10-14esu,比C60分子的三阶非线性系数χ(3)高一个数量级.通过实验测定的光克尔信号强度与激发光和探测光偏振方向夹角的依赖关系表明:30fs的超短激光脉冲激发富勒烯有机-无机杂化材料的克尔信号主要是源于光诱导双折射效应,而非用200fs的超短激光脉冲时来自瞬态栅的自衍射效应.
An ultrafast laser pulse with a central wavelength of 800 nm and a pulse width of 30 fs was used to investigate the ultrafast ultrafast nonlinear behavior of fullerene organic-inorganic hybrid materials by using Optical Kerr Shutter (OKS). The third-order nonlinearity coefficient χ (3) of the obtained fullerene organic-inorganic hybrid material is about 4.5 × 10-14esu, which is higher than the third-order nonlinear coefficient χ (3) of C60 molecule by 270fs switching time. The dependence of the optical Kerr signal intensity on the angle between the excitation and probe polarization directions shows that the Kerr signal of fullerene organic-inorganic hybrid materials excited by 30fs ultrashort laser pulses is mainly derived from Light-induced birefringence effects, rather than the self-diffraction effect from the transient grid when using 200 fs ultrashort laser pulses.