Interference effect on the liquid-crystal-based Stokes polarimeter
Interference effect on the liquid-crystal-based Stokes polarimeter
复制标题
液晶斯托克斯旋光计的干扰效应
DOI：
10.1088/1674-1056/abbbf4
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发表时间：
2020-12
影响因子：
1.7
通讯作者：
Sun Ying-Zi
中科院分区：
文献类型：
--
作者：
Hou Jun-Feng;Wang Dong-Guang;Deng Yuan-Yong;Zhang Zhi-Yong;Sun Ying-Zi
基于液晶可变延迟器（LCVR）的Stokes偏振计具有无需传统旋转偏振光学器件和提高测量速度等优点，有望成为空间偏振测量的一种新技术。然而，LCVR中固有的多光束干涉限制了其偏振精度的几个百分点。如何消除干涉效应的影响成为液晶偏振计亟待解决的问题。基于薄膜光学和偏振光理论，提出了一种简化但有效的干涉模型，模拟了基于LCVR的Stokes偏振计的干涉效应与偏振精度之间的关系。模拟结果表明，LCVR透射率随电压变化的原因是由于LCVR中ITO薄膜与液晶之间的多光束干涉产生了少量的仪器偏振。仪器偏振度约为0.01，并且对于不同的波长不同。提出了一种优化方法，将仪器偏振度降低到0.002，有效地提高了受干涉限制的斯托克斯偏振计的偏振灵敏度。此外，搭建了实验装置，测量和分析了优化前后基于LCVR的Stokes偏振计的干涉效应对偏振精度的影响。实验结果与仿真结果吻合较好。
The Stokes polarimeter based on liquid crystal variable retarders (LCVRs) is envisaged as a promising novel technique for polarization measurement in space applications due to the inherent advantage of eliminating the need for conventional rotating polarizing optics and increasing the measuring speed. However, the intrinsic multi-beam interference in LCVRs limits its polarization accuracy by several percent. How to eliminate the influence of the interference effect becomes an urgent issue for the liquid-crystal-based Stokes polarimeter. The present study introduces a simplified but effective interference model based on the thin-film optics and polarized light theory to simulate the relationship between the interference effect of the LCVRs-based Stokes polarimeter and the polarization accuracy. The simulation results show that the transmittance variation of LCVR with the derived voltage is caused by multi beam interference between the indium tin oxide (ITO) film and the liquid crystal within LCVR, which produces a few percent of instrumental polarization. The instrumental polarization is about 0.01 and different for different wavelengths. An optimization method was proposed to reduce the instrumental polarization to 0.002, effectively improving the polarization sensitivity of the Stokes polarimeter limited by the interference. In addition, an experimental setup was built up to measure and analyze the influence of the interference effect of the LCVRs-based Stokes polarimeter on the polarization accuracy before and after the optimization. The experiment results are in good agreement with the simulation.
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太阳望远镜偏振校准装置误差分析与优化设计
影响因子：
1.7
作者：
Hou Jun-Feng;Wang Dong-Guang;Deng Yuan-Yong;Sun Ying-Zi;Zhang Zhi-Yong
通讯作者：
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DOI：
10.1007/978-94-007-5618-2_4
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影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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