Investigating High Harmonic Generation Beam Dynamics with Ptychographic Lensless Imaging*

High Harmonic Generation (HHG) allows for tabletop EUV coherent light sources and attosecond pulses that can be used to probe material properties. While the process is relatively straightforward to implement, the beam quality of the harmonics is difficult to measure and control. A first step to realizing a tunable and fine controlled HHG setup is the ability to measure these quantities without having to change the setup drastically. Ptychography is a computational imaging technique that has already been used with HHG to reconstruct images of unique specimens. In this work, we shift the emphasis in computational imaging from reconstructing the specimen to understanding the details of the EUV light generated through HHG. Reconstructed harmonic beam profiles can then be propagated back to their generation point in the system to examine how they formed. Using this knowledge, we can optimize the factors affecting the HHG process and learn to control them.