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Static spectropolarimeter concept adapted to space conditions and wide spectrum constraints

机译：适用于空间条件和广谱约束的静态光谱偏振仪概念

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Issues related to moving elements in space and instruments working in broader wavelength ranges lead to the need for robust polarimeters that are efficient on a wide spectral domain and adaptable to space conditions. As part of the UVMag consortium, which was created to develop spectropolarimetric UV facilities in space, such as the Arago mission project, we present an innovative concept of static spectropolarimetry. We studied a static and polychromatic method for spectropolarimetry, which is applicable to stellar physics. Instead of temporally modulating the polarization information, as is usually done in spectropolarimeters, the modulation is performed in a spatial direction, orthogonal to the spectral one. Thanks to the proportionality between phase retardance imposed by a birefringent material and its thickness, birefringent wedges can be used to create this spatial modulation. The light is then spectrally cross dispersed, and a full Stokes determination of the polarization over the whole spectrum can be obtained with a single-shot measurement. The use of magnesium fluoride wedges, for example, could lead to a compact, static polarimeter working at wavelengths from 0.115 up to 7 mu m. We present the theory and simulations of this concept as well as laboratory validation and a practical application to Arago. (C) 2015 Optical Society of America
机译：与在空间中移动的元件以及在更宽的波长范围内工作的仪器有关的问题导致需要坚固的旋光仪，该旋光仪必须在宽光谱范围内高效且可适应空间条件。作为旨在发展太空中的光谱极化UV设施（例如Arago任务项目）而创建的UVMag联盟的一部分，我们提出了静态光谱极化技术的创新概念。我们研究了适用于恒星物理学的静态和多色光谱极化方法。代替通常在分光偏振计中进行的临时调制偏振信息，该调制是在与光谱一正交的空间方向上执行的。由于双折射材料施加的相位延迟与其厚度之间的比例关系，双折射楔可用于创建此空间调制。然后将光在光谱上进行交叉色散，并且可以通过单次测量获得对整个光谱偏振的完整斯托克斯测定。例如，使用氟化镁楔块可以导致紧凑的静态旋光仪在0.115到7微米的波长下工作。我们介绍了此概念的理论和模拟，以及实验室验证和对Arago的实际应用。 （C）2015年美国眼镜学会

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