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首页> 外文期刊>Physica status solidi, B. Basic research >Observation of phonon resonances in the optical nonlinearity in an alpha-sexithienyl thin film
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Observation of phonon resonances in the optical nonlinearity in an alpha-sexithienyl thin film

机译：α-Sexithienyl薄膜光学非线性中声子共振的观察

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摘要

Phonon resonances in the optical nonlinearity induced by the mixing of pump and probe pulses are investigated in an alpha-sexithienyl vacuum evaporated thin film. We have performed femtosecond differential transmission spectroscopy at room temperature and at 20 K using excitation energies from 2.14 to 2.4 eV. We observe simultaneously an induced transmission at the Stokes and at the anti-Stokes energetic position of the pump pulse which is only present during the temporal overlap of the pump and the probe pulse. The phonon associated with the C=C stretching mode of alpha-sexithienyl is involved in the coherent light-matter interaction for both the stimulated inverse Raman scattering at the anti-Stokes energetic position and for the Raman gain at the Stokes energetic position. [References: 14]
机译：在α-塞二噻吩基真空蒸发薄膜中研究了由泵浦脉冲和探针脉冲的混合引起的光学非线性中的声子共振。我们已经在室温和20 K下使用2.14至2.4 eV的激发能进行了飞秒差分透射光谱。我们同时观察到在泵浦脉冲的Stokes和反Stokes能量位置处的感应传输，该位置仅在泵浦和探测脉冲的时间重叠期间出现。与α-塞二噻吩基的C ＝ C拉伸模式相关的声子参与了反斯托克斯高能位置处的受激逆拉曼散射和斯托克斯高能位置处的拉曼增益的相干光-物质相互作用。 [参考：14]

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