200 TW peak power has been achieved experimentally using a Cr:forsterite master oscillator at 1250 nm, a stretcher, three optical parametrical amplifiers based on KD*P (DKDP) crystals providing 14.5 J energy in the chirped pulse at 910 nm central wavelength, and a vacuum compressor. The final parametrical amplifier and the compressor are described in detail. Scaling of such architecture to multipetawatt power is discussed.

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Diffraction gratings are key elements of laser systems with pulse compression. For providing of high peak power subpicosecond pulses these gratings should have a high damage threshold, large aperture and high optical quality. In the present work comparison holographic and ruled gratings for systems ofpulse compression is spent. Ruled gratings had spatial frequency 1740 grooves/mm, and holographic -1700 grooves/mm and were covered by gold, that provided 90 % diffraction efficiency to the first diffraction order. Measurements of damage thresholds for 1 ps and 0.5ns pulses have shown that for ruled grating it more than for holographic. It was probably connected to a thicker layer of metal for ruled gratings. To increase of a grating's damage threshold additional multi layer dielectric coatings were used. Computer calculations have shown that by changing of amount, material and thickness of layers it is possible to significantly improve damage thresholds. Experimental measurements have shown that for four layers there is the increase ofthresholds in 2 times. Received thresholds show, that for the being available sizes as ruled (l7Oxl7O mm), and holographic (200x400 mm) gratings generation of multyterrawatt laser pulses in CPA laser systems is possible.