Moreno Ignacio, Davis Jeffrey A, Klein Felix A, Mitry Mark J
Departamento de Ciencia de Materiales, Optica y Tecnología Electrónica, Universidad Miguel Hernández, Elche, Alicante, Spain.
Appl Opt. 2008 Apr 10;47(11):1797-801. doi: 10.1364/ao.47.001797.
We present a compact optical polarization-splitting common-path interferometer based on a zero-twist liquid crystal display (LCD). The LCD is encoded with a diffraction grating pattern and illuminated with a polarization state with both horizontal and vertical components. The polarization component perpendicular to the director axis of the liquid crystal molecules is not affected by the LCD and forms the reference beam. However, the polarization component parallel to the director axis is diffracted at an angle determined by the period of the grating. By imposing an analyzer polarizer, these two beams create an interferogram that can either display retardance patterns encoded onto the LCD or analyze external birefringent optical elements. The programmability of the system allows new ways of increasing the utility of the interferograms. Experimental results are provided, including the visualization of optical vortices with different and opposite topological charges.
我们展示了一种基于零扭曲液晶显示器（LCD）的紧凑型光学偏振分光共光路干涉仪。该LCD被编码为衍射光栅图案，并用具有水平和垂直分量的偏振态照明。垂直于液晶分子指向矢轴的偏振分量不受LCD影响，形成参考光束。然而，平行于指向矢轴的偏振分量以由光栅周期确定的角度衍射。通过施加分析器偏振器，这两束光产生干涉图，该干涉图既可以显示编码在LCD上的相位延迟图案，也可以分析外部双折射光学元件。该系统的可编程性为增加干涉图的实用性提供了新方法。文中给出了实验结果，包括对具有不同和相反拓扑电荷的光学涡旋的可视化。
