SO LAT反射器中偏振效应的物理光学分析
Physical Optics Analysis of Polarization Effects in SO LAT Reflectors
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中文总结 AI 辅助
本文对SO LAT反射器的偏振效应开展物理光学分析，发现其交叉德雷格反射器偏振性能良好，离轴馈源仅引入最大0.23度的小偏振偏移，为SO LAT偏振校准提供参考。
中文摘要 AI 辅助
我们对西蒙斯天文台大口径望远镜（SO LAT）的反射光学系统的偏振响应进行了物理光学分析。针对代表性馈源喇叭位置模拟了远场共极化和交叉极化波束图，并评估了相应的偏振角偏移。结果表明，交叉德雷格（crossed-Dragone）反射器系统具有良好的偏振性能。离轴馈源位置因光学不对称性会在远场偏振取向中引入与位置相关的小偏移，最大值为0.23度；但馈源喇叭偏振旋转下的相对偏振角偏移始终保持为零，在所考虑的频率范围内未发现显著的频率依赖性。这些结果为SO LAT中的偏振角校准和评估反射器引起的偏振系统误差提供了实用参考。
英文摘要
We present a physical-optics analysis of the polarization response of the reflective optical of the Simons Observatory Large Aperture Telescope (SO LAT). Far-field co-polar and cross-polar beam patterns are simulated for representative feedhorn positions, and the corresponding polarization-angle offsets are evaluated. The results show that the crossed-Dragone reflector system has good polarization performance. Off-axis feed positions introduce small, position-dependent offsets in the far-field polarization orientation, with a maximum value of 0.23 degrees, due to optical asymmetry. The relative polarization-angle offset under feedhorn polarization rotation, however, remains consistent with zero. No significant frequency dependence is found over the frequencies considered. These results provide a practical reference for polarization-angle calibration and for assessing reflector-induced polarization systematics in the SO LAT.
