Electrically controlled polarization-independent liquid-crystal Fresnel lens arrays.
Electrically controlled polarization-independent liquid-crystal Fresnel lens arrays.
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DOI：
10.1364/ol.16.000532
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发表时间：
1991-04
期刊：
影响因子：
3.6
通讯作者：
J. Patel;K. Rastani
中科院分区：
文献类型：
--
作者：
J. Patel;K. Rastani
本文描述了一种偏振无关的菲涅耳透镜阵列的结构和性能，这种透镜阵列采用双折射液晶，透镜的衍射效率可以电控。使用了一种新颖的结构，使得每个菲涅耳透镜的两个相邻区域中的液晶的主轴正交。这使得器件偏振独立。我们的特点是这些透镜在不同的应用领域和输入偏振衍射氩离子束聚焦。
We describe the properties and construction of a polarization-independent Fresnel lens array using nematic liquid crystals in which the diffraction efficiency of lenses can be electrically controlled. A novel structure is used such that the principal axis of the liquid crystals in two adjacent zones of each Fresnel lens are orthogonal. This makes the device polarization independent. We have characterized these lenses at different applied fields and input polarizations by diffracting an argon-ion beam into focus.