偏振全息成像斯托克斯分光偏振计在天文学中的应用

B. Kilosanidze, G. Kakauridze, I. Chaganava, T. Kvernadze, Georgi Kurkhuli, L. Oriol, M. Piñol, Q. Wei
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引用次数: 0

摘要

提出了一种新型的偏振全息成像斯托克斯分光偏振计。该偏振计的主要分析单元是积分偏振全息衍射元件,可以实时完整地分析入射光的偏振状态。它将入射光分解成衍射级,衍射级的强度根据光源的偏振状态而变化。同时测量衍射阶内对应点或区域的衍射阶强度后,得到光源的实时Stokes图像,从而可以确定一个点或扩展空间物体在不同光谱区域和变偏振下的整个偏振状态。一个工作孔径的直径可以从0.5厘米到5厘米。介绍了提高该元件稳定性和衍射效率的研究结果。利用标准星对偏振态进行测量,对分光偏振计进行标定。对一些天体进行了偏振测量。所得误差优于10-2。偏振全息成像Stokes分光偏振计没有机械移动或电可调的光学元件,没有内部反射,并且是通用的,紧凑的,成本效益高,重量轻。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Application of the polarization-holographic imaging Stokes spectropolarimeter in astronomy
An innovative polarization-holographic imaging Stokes spectropolarimeter is presented. The main analyzing unit of such a polarimeter is the integral polarization-holographic diffraction element, which enables the complete analysis of the polarization state of incoming light to be carried out in real-time. It decomposes the incoming light into diffraction orders, the intensities of which vary depending on the polarization state of the light source. After the simultaneous diffraction order intensity measurements of the corresponding points or areas in the diffraction orders, we get the real-time Stokes images of the light source, which allows determining the entire polarization state of a point or extended space object for different spectral regions and variable polarization. A working aperture can be from 0.5 cm up to 5 cm in diameter. The results of studies on improving the stability and diffraction efficiency of the element are presented. Measurements of the polarization state by the standard star were carried out to calibrate the spectropolarimeter. Polarimetric measurements of some astronomical objects have been carried out. The resulting errors are better than 10-2. The polarization-holographic imaging Stokes spectropolarimeter has no mechanically moving or electrically tunable optical elements, has no internal reflections, and is universal, compact, cost-effective, and lightweight.
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