本文介绍了二元光学元件的概况，衍射透镜理论，二元光学元件的制造方法以及发展趋势。
The introduction of binary optical elements, theory of diffractive lenses, fabrication of binary optical elements and trends are related.
根据菲涅耳衍射理论，采用微光学元件制作技术，通过三次套刻制作出八位相台阶的二元离轴菲涅耳透镜。
A binary Fresnel lens with 8 phase steps can be manufactured with micro-optical element fabricating technology and three times of alignment according to Fresnel diffraction theory.
借助于二元光学器件的独特性质，系统在仅使用两片锗透镜的情况下得到了接近衍射极限的光学质量。
The designed system benefits from the specialities of binary optical elements and approaches diffraction limitation by use of only two germanium lenses.
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