Fine design of Diffractive optical element for beam transform

摘要

Diffractive optical element (DOE) can be used for beam transform to obtain a certain required focused spot. The phase design of the DOE can be considered as an optimization problem and can be optimized by many kinds of algorithms. In optimization, the intensities of the sampling points are optimized to be consistent with the required beam transform, but the other points are not consistent with such demand. In this paper, fine design of the DOE is completed with a new sampling interval on the focal plane. The simulated results show that the intensity of any point on the focal plane is fully filled with the required beam transform, besides the used sampling points in the optimization.