Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel.
IFN-CNR and Dipartimento di Fisica-Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milano, Italy.
Sci Rep. 2017 Jul 31;7(1):6905. doi: 10.1038/s41598-017-06814-8.
We introduce a novel in-situ strong field ionization tomography approach for characterizing the spatial density distribution of gas jets. We show that for typical intensities in high harmonic generation experiments, the strong field ionization mechanism used in our approach provides an improvement in the resolution close to factor of 2 (resolving about 8 times smaller voxel volume), when compared to linear/single-photon imaging modalities. We find, that while the depth of scan in linear tomography is limited by resolution loss due to the divergence of the driving laser beam, in the proposed approach the depth of focus is localized due to the inherent physical nature of strong-field interaction and discuss implications of these findings. We explore key aspects of the proposed method and compare it with commonly used single- and multi-photon imaging mechanisms. The proposed method will be particularly useful for strong field and attosecond science experiments.
我们介绍了一种新的基于原位强场离化层析成像方法，用于表征气体射流的空间密度分布。我们表明，在高次谐波产生实验中的典型强度下，与线性/单光子成象模式相比，我们方法中使用的强场离化机制提供了接近 2 倍的分辨率提高（分辨出大约小 8 倍的体素体积）。我们发现，虽然线性层析成像的扫描深度受到驱动激光束发散引起的分辨率损失的限制，但在提出的方法中，由于强场相互作用的固有物理性质，焦点深度是局部化的，并讨论了这些发现的意义。我们探索了所提出方法的关键方面，并将其与常用的单光子和多光子成象机制进行了比较。所提出的方法将特别有益于强场和阿秒科学实验。
