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.
计算结果表明，二元透镜在平场光学系统中具有实用价值。
The calculated results show that the binary lens has practical application value in field flattening optical system.
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.
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