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Research on measuring polarization state of light by Stokes parameters based on electro-optic effect

机译：基于电光效应的斯托克斯参数测量光的偏振态的研究

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摘要

The polarization information of light can be used to improve the possibility of target recognition. Stokes parameters can express all kinds of polarization states compared with the Jones matrix. Many ways have been developed to measure light polarization state by Stokes parameters. But traditional systems meet challenges in stability and velocity. A new method was proposed in this paper to apply two cascaded LiNbO3 crystals as a phase retarder in replacing the wave plate. It has the merits of static without moving elements and rapid measurement. The transversal electro-optic effect is exploited to avoid the high voltage loaded on a LiNbO3 crystal. Four different voltages were loaded on eight LiNbO3 crystals respectively to obtain four values of related phase difference and four intensity values recorded on the detector one time, from which the Stokes parameters of the detected light can be obtained to express the light polarization state. This system has the possibility to measure high speed changing polarized light even less than microseconds. The experiments were performed to prove the feasibility of this proposed method. The calculated polarization state is close to the expected Stokes parameters for the linearly and circularly polarized light. It is suitable for the fields demanding stable and real-time monitoring the changing of polarization state. (C) 2015 Optical Society of America
机译：光的偏振信息可用于提高目标识别的可能性。与琼斯矩阵相比，斯托克斯参数可以表示各种极化状态。已经开发出许多通过斯托克斯参数来测量光偏振态的方法。但是传统系统在稳定性和速度方面面临挑战。本文提出了一种新的方法来应用两个级联的LiNbO3晶体作为相位延迟器来代替波片。它具有静态特性，无需移动元素，并且测量迅速。利用横向电光效应来避免在LiNbO3晶体上加载高电压。分别在八个LiNbO3晶体上加载四个不同的电压，以获得四个相关相位差值和一次记录在检测器上的四个强度值，从中可以获取检测到的光的斯托克斯参数来表示光的偏振态。该系统有可能测量甚至小于微秒的高速变化偏振光。实验证明了该方法的可行性。计算出的偏振态接近线性和圆形偏振光的预期斯托克斯参数。适用于要求稳定，实时监测极化状态变化的领域。 （C）2015年美国眼镜学会

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