The diffract optical filters are important to practical optical system presently.Many functions that are difficult to realize for traditional optical elements can be achieved by using these filters.

• 衍射光学元件是目前光学应用系统中非常重要的一个部分，它能实现传统光学许多难以达到的目的和功能，因而在国际上都普遍受到重视。