Fine design of diffractive optical element for true beam shaping

Diffractive optical element (DOE) can be used for beam shaping to realize s ome required intensity distributions on the focal plane. The phase design o f the DOE is generally considered as an optimization problem and optimized by many kinds of algorithms. In optimization, the intensities of the sampli ng points on the focal plane are optimized to be consistent with the requir ed beam shaping, but the other points are not consistent with such a requir ement. In this paper, according to qualitative analysis, a new design metho d with a new sampling interval on the focal plane is adopted to design the DOE for realizing two kinds of true beam shaping. The results obtained by t his new method are that the intensity of any point on the focal plane is fu lly filled with the required demands. besides the used sampling points in t he optimization.