研究了相位型电控全息聚合物分散液晶（H-PDLC）菲涅耳透镜的制备及其特性。采用马赫曾德尔干涉光路产生与菲涅耳波带片环带结构相同的干涉图样，以全息记录的方式对聚合物分散液晶（PDLC）材料进行曝光，制作出H-PDLC菲涅耳透镜。用所制得的透镜进行了透射与衍射实验、多焦点变换成像实验以及电控光学衍射特性实验。实验结果表明H-PDLC菲涅耳透镜是一种衍射型光学元件，其光学衍射特性可受电场信号的调控。在633 nm波长下，测得透镜的主焦距约为33 cm，用菲涅耳波带片衍射理论研究了H-PDLC菲涅耳透镜多重成像的机理，演示了H-PDLC菲涅耳透镜多焦点的变换成像，讨论了这种变换成像的规律。

Fabrication and characteristic research of electrically controlled holographic polymer dispersed liquid crystal (H-PDLC) phase-type Fresnel lens is reported. The Mach-Zehnder interference optical path is used to produce interference pattern with zonal texture that is identical to Fresnel zone plate. The interference pattern is recorded into polymer dispersed liquid crystal (PDLC) material in the form of holography to fabricate H-PDLC Fresnel lens. The transmission and diffraction experiments, multifocal transform imaging experiment and electrically controlled optical diffraction experiments have been carried out. The experimental results show that H-PDLC Fresnel lens is diffraction-type optical device and the diffraction property can be controlled by external voltage. Under the 633 nm wavelength, the measured main focal length of lens is about 33 cm. The mechanism of multiple imaging of H-PDLC Fresnel lens is studied using diffraction theory of Fresnel zone plate. Additionally, multifocal transform imaging of H-PDLC Fresnel lens is demonstrated and its rules are discussed.