Activity: Talk or presentation › Oral presentation
We investigate the possibility to realize a fully coherent light source emitting XUV down to 4 nm by using high harmonic generation (HHG) in an ionized medium. However, due to the strong ionization, current phase-matching techniques for HHG are not suitable. Instead, we will investigate quasi-phase matching (QPM) and wave guiding over an extended interaction length to increase the output pulse energy. For this, we will ionize a density modulated cluster jet to prepare a plasma waveguide with an appropriate density modulation along its axis for QPM. Here, we first report on the characterization of the argon cluster jet with a modulated grid. We employ Rayleigh scattering imaging and interferometry to infer the cluster size and the density distribution in the jet. Later, the modulated plasma waveguide will be generated. We present the temporal and spatial evolution of total electron density as measured by transverse interferometry technique. Additionally, the shortest possible modulation period will be discussed.