Perspectives of parametric generation of coherent XUV radiation at ELI Beamlines facility

The main workhorse of the production of coherent XUV attosecond pulses, and therefore a tool of choice for atomic and molecular physics applications, is the high-order harmonic generation technique (HHG). The HHG technique, however, has its limits: it cannot deliver high-energy XUV pulses. The HHG's problem is fundamental: the HHG process is very inefficient, which strongly limits XUV applicability. We propose to use a recently demonstrated powerful alternative technique of XUV generation, based on the high-order parametric processes. We discuss the results and the feasibility at the unique ELI Beamlines laser facility.