利用边缘相位校正实现光束整形的高精度优化

提出利用边缘相位校正的新方法，校正用追迹法设计的产生环形光束的衍射光学元件的相位分布，从而实现光束整形中的高精度优化。通过将高斯光束整形为环形光束，将该方法、G-S(Gerchberg-Saxton)算法和改进的G-S算法设计得到的整形结果作了比较，结果表明，G-S算法的整形结果虽然衍射效率最大，但是均方根值和最大偏差也太大；改进的G-S算法可以有效的降低均方根值和最大偏差，但衍射效率也有较大的下降；而用边缘相位校正可以在衍射效率略微下降的情况下，更大的降低均方根值和最大偏差，其整形结果是综合了衍射效率、均方根值和最大偏差这三个评价指标以后得到的最优化结果，已接近理想的环形光束。

High-Accuracy Optimization for Beam Shaping Using Marginal Phase Correction

A high-accuracy optimization method for beam sh aping, the marginal phase correction, is presented for correcting the phase of t he diffractive optical element (DOE) designed by ray tracing to generate a ring -shaped beam. Using an instance of converting a Gaussian beam into a ring-shap ed profile, the shaped results of DOEs designed by this new approach, Gerchberg -Saxton (G-S) algorithm and improved Gerchberg-Saxton algorithm are compared. The compared results show that the Gerchberg-Saxton algorithm simultaneously b rings about high diffraction efficiency and large root-mean square value and ma ximum error; the improved Gerchberg-Saxton algorithm can effectively decrease t he root-mean-square value and maximum error but also drop down the diffraction efficiency too much; this new approach can balance the diffraction efficiency, root-mean-square value and maximum error to obtain the least root-mean-squar e value and maximum error upon the slight decrease of diffraction efficiency. Th e shaped ring of the beam by this new method approaches a perfect ring.