Research on the development of a method of spatially temporary smoothing of a high-power laser beam

The investigations of the influence of various types of wavefront distortio ns, varying in time, on the intensity distribution on the surface of a targ et are carried out. It is shown that distortions of a wavefront, equivalent to transverse displacement in time of a beam in far field at an angle of a pproximately 10 diffraction angles, results in practically full smoothing o f a specl-structure of intensity distribution. Creation of phase distortion s of a beam assigned as running in a cross section wave with an amplitude o f more than 3 radian and with a spatial size exceeding 20-30 times the size of the kinoform phase plate element, permits us to reduce the depth of mod ulation in distribution of intensity in far field also. The capability of a pplication is considered as a smoothing device of the dynamic plasma layer, based on the volume-structured medium. The model of energy transport proce ss in such media is developed. Matching of calculation and experimental res ults is conducted.