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Abstract

In this work the home-built four-quadrant split-mirror of the X-MuSIC beamline is characterised by an interferometric measurement. For this purpose the stability was investigated with a HeNe laser and the temporal overlap between the mirrors themselves was determined under the use of the Ti:Sa laser system available in our lab. This four-quadrant mirror setup is the key to future four-wave mixing (FWM) experiments in the extreme ultraviolet (XUV) spectral region. Beginning with analysing stability properties and finding temporal overlap between the mirrors this work continues with the first measurements on NIR-NIR-XUV four-wave mixing in neon in the extreme ultraviolet (XUV) spectral region. Futhermore the first XUV-only FWM experiments in neon were performed using the four-quadrant mirror in the XUV region at the free-electron laser facility FLASH in Hamburg (Germany). The carried-out experiments can be seen as a working proof of the four-quadrant split-mirror and as a basis for future progress in four-wave mixing experiments at the X-MuSIC beamline.