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首页> 外文会议>Conference on Applied Optics and Photonics China >Polarization Aberrations in an Unobscured Off-Axis Astronomical Telescope and Their Effects on PSF Ellipticity
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Polarization Aberrations in an Unobscured Off-Axis Astronomical Telescope and Their Effects on PSF Ellipticity

机译：在视野开阔的轴外天文望远镜中的极化像差及其对PSF椭圆度的影响

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摘要

Due to the continuously increasing detection ability in astronomy, polarization aberrations are playing more and more important roles in the performances of astronomical telescopes. In this paper, polarization aberrations of an unobscured off-axis astronomical telescope, which is designed to detect weak gravitational lensing signal, are analyzed via polarization ray trace. The diattenuation map and retardance map of each mirror of the telescope are obtained, and both its Jones pupil and amplitude response matrix are shown. Because of polarization aberrations, the imaging contrast of the telescope is limited to be at a level of le-5, and the PSF spatial distribution of the telescope varies, too. Optics ellipticity of the telescope is analyzed. The variations of optics ellipticity, which are dependent of field of view (FOV), are induced by polarization aberrations. The maximum and mean variations of the optics ellipticity in all FOVs are 7.5e-3 and 2.7e-3, respectively. At the FOV [-0.0487°, 0.155°], the maximum ellipticity interpolation error increases from 1.2e-4 to 1.1e-3. According to the analyses shown in this paper, we can see that polarization aberrations in the telescopes which aim to detect weak gravitational lensing signal and demand ultrahigh imaging performance are not negligible. Hence, polarization aberrations should be involved to optimize these telescopes.
机译：由于在天文学中不断增加的检测能力，偏振像差在天文望远镜的性能中起着越来越重要的作用。本文通过偏振射线轨迹分析了设计用于检测弱重力透镜信号的视野外轴天文望远镜的极化像差。获得了望远镜的每个镜子的利通图和延迟图，并且显示了其琼斯瞳孔和幅度响应矩阵。由于极化像差，望远镜的成像对比度限于Le-5的水平，并且望远镜的PSF空间分布也变化。分析了望远镜的光学椭圆形。由偏振像差引起的依赖于视野（FOV）的光学椭圆度的变化。所有FOV中的光学椭圆度的最大和平均变化分别为7.5e-3和2.7e-3。在FOV [-0.0487°，0.155°]，最大椭圆形插值误差从1.2E-4增加到1.1E-3增加。根据本文所示的分析中，我们可以看到在其目的是检测弱引力透镜信号和要求超高成像性能是不能忽略的望远镜该偏振像差。因此，应涉及极化像差来优化这些望远镜。

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