产生多焦环的衍射相位元件设计的新方法

A NEW DESIGN METHOD OF DIFFRACTIVE PHASE ELEM ENTS FOR GENERATING MULTI FOCAL ANNULI

基于光学变换的一般理论，提出了一种产生多焦环的衍射相位元件的新设计方法，焦环的数目、位置和焦环的宽度可以任意设定．在高斯型激光束照明下进行模拟设计，并讨论了相位量化对结果的影响．理论计算表明。

Based on the general theory of the optical transformation, a new method for designing diffractive phase elements generating multi focal annuli is presented. The number and the position of focal annuli, as well as the width of focal annuli may be predetermined arbitrarily according to the particular demands. Several simulation designs are carried out for the Gaussian profile laser illumination. We also investigate the influence of phase quantization on the results of designs. The simulation calculations show that the new method can be successfully applied to the designs of the desired diffractive phase elements for generating multi focal annuli.