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Techniques of diffractive optical elements (DOEs) based on computer-generated holograms are surveyed. This type of DOE is numerically designed and optimized by using an iterative diffraction algorithm or a nonlinear search algorithm. In this report, a beamshaper designed by employing the former type of algorithm is presented. The beamshaper is capable of transforming an incident Gaussian beam into a specific beamshape, which has a complicated pattern modeled on a printed circuit with a spatial resolution of tens of micron. The actual procedure for designing the beamshaper and the criteria used to determine the design parameters are reported. Furthermore, an evaluation of the designed and fabricated beamshaper and several ideas for improving it are discussed.

A Diffractive Optical Element Designed for Arbitrary Pattern Beam Shaping by Use of Iterative Optimization Algorithm