DEFORMATION INSTABILITY AND GENERATION OF ORDERED SURFACE-STRUCTURES BY LASER-RADIATION

A model is proposed to account for a deformation instability which app ears under the action of powerful laser radiation in a system of point defects on the surface of a solid with a high density of sinks. It is shown that the development of this instability under conditions linea r in respect of the amplitude creates complex three-dimensional surfac e structures of coupled strain and defect-density fields (rings, radia l arrays, one- and two-dimensional lattices). Dispersion relationships are derived for the growth increment of these structures and their ch aracteristic sizes (grating period, number of rays in a structure) are found.