ABSTRACT
Luminescence of ionic crystals excited by the LULI X-ray laser has been observed in the UV range. The laser supplied up to 1014 photons in 80 ps pulse at the wavelength of 21.2 nm. A single shot was sufficient to obtain luminescence spectra with good resolution. The use of different illumination conditions, from 1.4 109 to 1.7 1011 photons, showed the collapse of the luminescence efficiency for strong illumination. This quenching effect is discussed in terms of the large increase of electronic excitation mean density, which alters the usual process of luminescence centre production.
