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由旋转棱镜（ａｘｉｃｏｎ）器件生成的无衍射光束（ｄｉｆｆｒａｃｔｏｎ－ｆｒｅｅｂｅａｍｓ）横截面上的光强分布具有传播不变性，因而具有相当广泛的应用前景。介绍了无衍射光束及其特性，提出二元ａｘｉｃｏｎ的设计方法，并给出了计算机模拟的设计结果。
The light intensity distribution in the cross section of a diffracton-free beam generated by an axicon device has propagation invariance and thus has a wide range of applications. The non-diffracted beams and their characteristics are introduced. The design method of the binary axicon is proposed and the design results of the computer simulation are given.