title: Efficient method for evaluation of the diffraction efficiency upper bound of diffractive phase elements.
abstract: The theoretical diffraction efficiency upper limit of diffractive phase elements (DPE's) with finite apertures is investigated. A successful numerical method of evaluating the efficiency upper bound of DPE's is proposed. The method includes a hybrid optimization procedure that combines a genetic algorithm with the conjugate gradient method. This efficient global optimization technique can also be used to design DPE's. Simulation computations are detailed for rotationally symmetric beam shaping in which a Gaussian profile laser beam is converted into a uniform beam. Numerical results demonstrate that the estimated diffraction efficiency upper bound is consistent with the design results.
authors: G
authors: G
authors: Zhou
authors: X
authors: X
authors: Yuan
authors: P
authors: P
authors: Dowd
authors: Y L
authors: YL
authors: Lam
authors: Y C
authors: YC
authors: Chan