Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany.
Phys Chem Chem Phys. 2011 May 21;13(19):8621-6. doi: 10.1039/c0cp02263b. Epub 2011 Apr 11.
We present ultrafast polarization pulse shaping through a micro structured hollow core photonic crystal fiber. The pulses are shaped in pulse sequences in which the energy, distance, phases, and chirps as well as the state of polarization of each individual sub-pulse can be independently controlled. The application of these pulses for coherent control is demonstrated for feedback loop optimization of the multi-photon ionization of potassium dimers. In a second experiment, this process is investigated by shaper-assisted pump-probe spectroscopy which is likewise performed with pulses that are transmitted through the fiber. Both techniques reveal the excitation pathway including the dynamics in the participating electronic states and expose the relevance of the polarization. These methods will be valuable for endoscopic applications.
我们通过微结构中空芯光子晶体光纤实现了超快偏振脉冲整形。这些脉冲被成形为脉冲序列,其中每个子脉冲的能量、距离、相位、啁啾以及偏振状态都可以独立控制。这些脉冲在钾二聚体多光子电离的反馈回路优化中的相干控制应用得到了证明。在第二个实验中,通过整形器辅助的泵浦探测光谱学研究了这个过程,同样使用通过光纤传输的脉冲进行实验。这两种技术都揭示了包括参与电子态动力学在内的激发途径,并揭示了偏振的相关性。这些方法对于内窥镜应用将是非常有价值的。