Ptychography and Single-Shot Nanoscale Imaging with Plasma-Based Laser Sources
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We report the direct wavefront characterization of an intense ultrafast high-harmonic seeded soft X-ray laser at 32.8 nm wavelength and monitor the exit of the laser plasma amplifier depending on the arrival time of the seed pulses with respect to pump pulses. For the wavefront measurement in phase and intensity, we used high-resolution ptychography. After propagating the wavefront back to the source, we are able to observe the rear end of the plasma amplifier. We compare the characteristics of the seeded soft X-ray Laser to an unseeded one and find an increasing beam stability and lateral coherence important for lensless imaging techniques.
The research leading to these results has received funding from LASERLAB-EUROPE (grant agreement no. 654148, European Union’s Horizon 2020 research and innovation programme) and through a research group in the State of Thuringia funded by the European social fund (2015 FGR 0094). Furthermore, the authors acknowledge the QUEST for ENERGY project funded by the Federal Ministry of Education and Research (BMBF) under “Make our Planet Great Again—German Research Initiative”, Grant No. 57427209, implemented by the German Academic Exchange Service (DAAD). M. Z. acknowledges the Alexander von Humboldt association.
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