Hannover 2020 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 22: Posters: Quantum Optics and Photonics II

Q 22.15: Poster

Tuesday, March 10, 2020, 16:30–18:30, Empore Lichthof

Investigations toward diffraction imaging by High Harmonics — •Kai Lennard Rose, Dirk Hemmers, and Georg Pretzler — Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf

High Harmonic Generation (HHG) by ultrashort laser pulses is a useful way of generating spatially coherent directed radiation in the vacuum and extreme ultraviolet (VUV to XUV) spectral range. Especially the so-called water window (2.3 nm - 4.4 nm) with its high transmission by oxygen and strong absorption by carbon is an advantageous region for imaging of organic materials and is often used with other radiation sources. Applying harmonic radiation in this range promises new opportunities by employing its coherence properties with phase-related diagnostic techniques. We performed feasibility studies on diffraction imaging of µm-scale test objects by harmonics in the micrometer-range produced by the few-cycle Ti:Sa-system PHASER in Düsseldorf. First experimental results together with analytical and numerical simulations are presented. These results show that the coherence of the harmonic radiation carries a large potential for further developments.