Alternative Design of Binary Phase Diffractive Optical Element with Non-π Phase Difference

It was found that binary phase diffractive optical element (DOE) with non-π difference had higher diffraction efficiency and adjustable zero-order intensity than a 0-π one. However, existing design methods are all based on the simulated annealing algorithm thus computationally expensive. In this paper, simple efficient method using iterative Fourier transform (IFTA) is proposed. method, target pattern first modified via reducing intensity. Then, IFTA adopted to conventional DOE. Subsequently, distribution remains unchanged carefully adjusted increase so reconstructed consistent target. To verify several typical DOEs for beam splitting were designed fabricated, result showed proposed effective.