Hannover 2020 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 22: Posters: Quantum Optics and Photonics II

Q 22.16: Poster

Dienstag, 10. März 2020, 16:30–18:30, Empore Lichthof

Parametric studies of High Harmonic Generation in gases in the few-nm range — •Natascha Thomas, Dirk Hemmers, and Georg Pretzler — Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf

High Harmonic Generation (HHG) in gaseous media is a convenient technique for generating coherent, laser-like radiation ranging from the VUV to the soft X-ray regime. Specific interest lies on the so-called water window (wavelengths between 2,3 nm and 4,4 nm), where oxygen is transparent and carbon highly absorptive with important applications in biology and medicine. Previously, this range has been accessed via driving lasers in the IR. We present elaborate HHG parameter studies using the PHASER few-cycle Ti:Sa-system in Düsseldorf, which aim at optimizing the harmonic output in the few-nm range. We show how the spectral cutoff can be shifted systematically by combined variation of multiple parameters, most of all the precise optimization of intensity in the interaction region by means of our new pulse attenuator.