Presently an excimer mediums continue are examined as one of variants for formation of powerful and over
powerful pulses of laser radiation with duration from units of nanosecond up to tens femtosecond. The researches on
such powerful installations as "NIKE" (USA) and << SUPER ASHURA >> (Japan) proceed in this direction. The main
advantage of excimer mediums is the opportunity to work in a frequency mode, absence of restriction on the size of
active area, high uniformity of a gas working medium, high efficiency (up to 10 %) and wide spectral range of laser
radiation (KrF, XeCl ~ 2nm, XeF (C-A), Xe2Cl ~ 50-100 nanometers). Research in area of high quality laser beams formation in excimer mediums and its amplification in high power
amplifiers are carried out the long time in Institute of High Current Electronics SB RAS, Tomsk, Russia. The wide aperture XeCl laser system of MELS-4k is used for these investigations. Last time we take part in program on development of high power excimer laser system with a petawatt level of power. This system supposes the formation and
amplification high quality laser beams with different pulse duration from units of nanosecond up to tens femtosecond.
We research the possibility of laser beams formation in excimer mediums with ps-ns pulse duration having the low noise
and divergence near to diffraction limit. In other hand, we are developing the wide aperture XeF(C-A) amplifier with
optical pump on base electron accelerator. According to our estimations of the XeF(C-A) amplifier based on the
converter of e-beam energy to the Xe2* fluorescence at 172 nm will allow to obtain up to 100 TW peak power in a 30 fs pulse.