A kind of diffraction element modulating phase information by LC space light modulator to get a zoom fresnel lens, as well as the using of said element to optical imaging system, is introduced.

• 本文介绍一种以液晶空间光调制器作为调制位相信息的衍射元件,获得可变焦长的菲涅耳透镜,以及该元件在光学成像系统中的应用。