最小偏振能见度损失的恒星干涉仪设计

W. Traub
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引用次数: 0

摘要

考虑了恒星干涉仪臂部反射镜表面非正入射光学相移的影响。给出了波长相关的条纹可见性损失的显式表达式,该损失是由非偏振辐射的垂直和平行反射分量之间的可测量相移引起的。这种损耗的发生是由于干涉仪各臂的反射比一般不同。提出了一种消除这些潜在退化效应的光学设计方法。这种方法本质上说,每条臂上的辐射应该经历反射,在光束分裂点和合并点之间具有相同的方向余弦序列。我们还证明了干涉仪的其他有用的性质是由这个规则得到的。波长相关的相移测量在真实的镜子提出,允许对任何光学配置的退化因素的数值评估。各种光学配置显示,以说明影响,包括新的COSMIC(相干光学系统的模块干涉集热器)设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stellar Interferometer Design for Minimizing Polarization-Induced Visibility Losses
The effects of non-normal-incidence optical phase shifts at the surfaces of mirrors in the arms of stellar interferometers are considered. An explicit expression is given for the wavelength-dependant loss in fringe visibility which results from measureable phase shifts between the perpendicular and parallel reflected components of unpolarized radiation. This loss occurs as a result of the generally different reflection to-pologies in the various arms of an interferometer. An optical design method is presented which eliminates these potentially degrading effects. This method essentially says that the radiation in each arm should experience reflections having the same sequence of direction cosines between the point where the beam is divided and the point where it is combined. We also show that other useful properties of interferometers are obtained by following this rule. Wavelength-dependent phase-shift measurements on real mirrors are presented, allowing numerical evaluation of the degradation factor for any optical configuration. Various optical configurations are shown to illustrate the effect, including new COSMIC (Coherent Optical System of Modular Interferometric Collectors) designs.
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