Sagagd method for the beam shaping of uniform illumination

In this paper, the simulated annealing algorithm, the genetic and the gradient descent algorithm are retrospectively and successfully amalgamated to optimal design of pure phase element for uniform beams. The process of this method is divided into three steps, first the energy enhancement of the main lobe, then the process to make the top of the main lobe to be smooth and the fringe to be steep, at last the of the full optimization beam. After these three steps of optimization, the beam is good enough to be applied to ICF.