论文标题
低频共线抗抗冲动性刺激的拉曼光谱法
Low Frequency Collinear Pre-Resonant Impulsive Stimulated Raman Spectroscopy
论文作者
论文摘要
在这项工作中，我们将低频冲动刺激的拉曼微光谱镜扩展到电子共振前体。我们使用宽带两种颜色共线泵探针方案，可以很容易地扩展到成像。我们讨论了这种类型的测量的困难，以竞争的谐振两光孔过程的形式以及克服它们的手段。我们通过消除检测到的光谱成分而成功地降低了由于那些竞争过程而产生的噪声，这些光谱成分并不导致样品的振动特征，尽管引入了大多数噪声。最后，我们在近谐振泵送下显示了晶体样品的低频光谱法，显示了由于与电子自由度耦合而引起的增强和光谱修饰。
In this work we extend low frequency impulsive stimulated Raman microspectroscopy to the pre-electronic resonance regime. We use a broadband two color collinear pump probe scheme which can be readily extended to imaging. We discuss the difficulties unique to this type of measurements in the form of competing resonant two-photon processes and the means to overcome them. We successfully reduce the noise which arises due to those competing processes by eliminating the detected spectral components which do not contribute to the vibrational signature of the sample though introduce most of the noise. Finally, we demonstrate low-frequency spectroscopy of crystalline samples under near-resonant pumping showing both enhancement and spectral modification due to coupling with the electronic degree of freedom.
