Vacuum-ultraviolet and extreme ultraviolet spectroscopy

       The high-intensity short pulse laser beam generates hot plasmas on the solid surfaces which contain highly ionized atoms. One of the most exciting application of laser plasma investigations with short pulse lasers is the generation of ultrashort x-ray and UV pulses.

       Vacuum ultraviolet (VUV) spectroscopy is carried out in the 10-200 nm range using holographic toroidal gratings and phosphor-coated microchannel-plate detectors. The VUV radiation is thus spectrally resolved and then converted to visible light, which is then detected by CCD detecors. Extreme-ultraviolet (EUV) spectroscopy can be carried out by transmission gratings in the 1-30 nm spectral range.

       The effects of prepulses onto the conversion ratio is investigated at present. Another interest is the investigation of the early stage, near-threshold effects for laser plasmas generated by subpicosecond, UV laser pulses.