High-order harmonic generation in complex laser fields

Abstract

This work presents the recent progress in the field of high-order harmonic generation in complex laser fields. First, the harmonic generation is discussed from the general point of view consulting the most recent updates in the field. Then, the section giving an insight into the UV-driven HHG scheme to provide tunable and monochromatic radiation at 21.5 eV is presented with both, theoretical and experimental parts. This section is followed by a report on generation of circularly polarized XUV light at the HHG Beamline at ELI Beamlines. Afterwards, the possibility of controlling the XUV wavefront of the generated harmonic using the two-color laser beam is provided. Experimental results are supported by numerical modelling with the fully reproduced experimental results and explanation of the observed features. In the last section, a new approach to HHG efficiency improvement by a process of high parametric generation is theoretically discussed. Results of the technical part are presented, including the THz generation and construction of the THz spectrometer needed for the project.