High-order harmonic generation (HHG) is a tabletop source of VUV radiation with many applications limited by a necessity for a specific photon energy and a monochromatized spectrum. The approach of using grating monochromators is not applicable for photon-hungry applications due to the high losses and pulse lengthening. We present experimental results of a wavelength-tunable monochromatic HHG source developed to tackle this challenge. We demonstrate this method using the L1 Allegra broadband OPCPA laser system at ELI-Beamlines and its conversion to UV used to pump the HHG.
ELI Beamlines is a large European laser facility housing state-of-the-art high power lasers that drive secondary sources of photons and charged particles for user applications. The MAC end-station at ELI Beamlines is a Multipurpose station for AMO (atomic, molecular and optical sciences) and CDI (coherent diffractive imaging). It is designed for investigations of ultrafast dynamics in low-density targets (atoms, molecules or nanostructures) employing fs-synchronized EUV and NIR/Vis beams. In this contribution, we introduce experimental capabilities of the MAC station, show few resent scientific outcomes, discuss ongoing user projects and access procedure for the user-community.
Three main paths have been selected within the ELI Beamlines research program for transforming driving laser pulses into brilliant beams of short wavelength radiation: High-order harmonic generation in gases, Plasma X-ray sources, and sources based on relativistic electron beams accelerated in laser-plasma. For each of these research areas, dedicated beamlines are built to provide a unique combination of X-ray sources to the user community. The employment of these beamlines has a well-defined balance between fundamental science and applications in different fields of science and technology. Besides those beamlines, a plasma betatron radiation source driven by the PW-class HAPLS laser system is being commissioned in the plasma physics platform to serve as a unique diagnostic tool for dense plasma and warm dense matter probing.
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