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首页> 外文期刊>Optics Letters >Origin of third-order optical nonlinearity in Au : SiO2 composite films on femtosecond and picosecond time scales
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Origin of third-order optical nonlinearity in Au : SiO2 composite films on femtosecond and picosecond time scales

机译：飞秒和皮秒时间尺度上Au：SiO2复合膜中三阶光学非线性的起源

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Three sorts of probe laser, which have pulse durations of 200 fs, 35 ps, and 70 ps, were employed in the measurement of the third-order nonlinear optical susceptibility chi((3)) in Au:SiO2 composite films in a degenerate four-wave mixing scheme. me found that the composite films at their absorption peak (similar to 550 nm) had a maximum chi((3)), which depends strongly on the pulse width of the probe laser. The value of chi((3)) measured with a 70-ps laser was similar to 30 times larger than that measured with a 200-fs laser. The time-resolved measurements revealed that the optical nonlinearity on the femtosecond time scale is attributable mainly to contributions from the interband electric-dipole transition (especially at low concentrations) and partly to those From hot electrons rather than being dominated by hot-electron excitation in the picosecond regime. (C) 1998 Optical Society of America. [References: 13]
机译：在三种退化的Au：SiO2复合薄膜中，使用三种脉冲时间分别为200 fs，35 ps和70 ps的探测激光测量三阶非线性光学磁化率chi（（3））。混合方案。我发现复合膜在其吸收峰（类似于550 nm）处具有最大chi（（3）），这在很大程度上取决于探针激光器的脉冲宽度。用70 ps激光测量的chi（（3））值大约是用200 fs激光测量的chi（（3））的30倍。时间分辨的测量结果表明，飞秒时间尺度上的光学非线性主要归因于带间电偶极跃迁（尤其是在低浓度下）的贡献，部分归因于来自热电子的贡献，而不是受热电子激发的影响。皮秒制度。 （C）1998年美国眼镜学会。 [参考：13]

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