The Wide-Area Linear Optical Polarimeter (WALOP)-South instrument will be mounted on the 1-m South African Astronomical Observatory telescope in South Africa as part of the Polar-Areas Stellar Imaging Polarization High Accuracy Experiment (PASIPHAE) program to carry out a linear imaging polarization survey of the Galactic polar regions in the optical band. Designed to achieve polarimetric sensitivity of 0.05% across a 35 × 35 arc min field of view (FOV), it will be capable of measuring the Stokes parameters I, q, and u in a single exposure in the R broadband and narrowband filters between 0.5 to 0.7 μm. For each measurement, four images of the full field corresponding to linear polarization angles of 0 deg, 45 deg, 90 deg, and 135 deg in the instrument coordinate system will be created on four detectors from which the Stokes parameters can be found using differential photometry. In designing the optical system, major challenges included correcting for the dispersion introduced by large split angle Wollaston prisms used as analysers and other aberrations from the entire field to obtain imaging quality point spread function (PSF) at the detector. We present the optical design of the WALOP-South instrument which overcomes these challenges and delivers near seeing limited PSFs for the entire FOV.

中文翻译：

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WALOP-South：用于PASIPHAE调查的四台相机单镜头成像旋光仪。论文一-光学设计

广域线性光学旋光仪（WALOP）-南方仪器将安装在南非1米长的南非天文台望远镜上，这是极地恒星成像偏振高精度实验（PASIPHAE）计划的一部分，光学波段中银河极区的线性成像偏振测量。其设计旨在在35×35电弧最小视场（FOV）上实现0.05％的极化灵敏度，它将能够在R宽带和窄带滤光片之间的一次曝光中测量斯托克斯参数I，q和u至0.7μm。对于每次测量，全场的四个图像分别对应于0度，45度，90度，仪器坐标系中的135度将在四个探测器上创建，可以使用差分光度法从中找到斯托克斯参数。在设计光学系统时，主要挑战包括校正大分角的用作分析仪的沃拉斯顿棱镜引入的色散以及整个领域的其他像差，以在检测器上获得成像质量点扩散函数（PSF）。我们介绍了WALOP-South仪器的光学设计，它克服了这些挑战，并为整个FOV提供了近乎有限的PSF。主要挑战包括校正大角度分裂的沃拉斯顿棱镜（用作分析仪）引入的色散以及整个视场的其他像差，以在检测器上获得成像质量点扩散函数（PSF）。我们介绍了WALOP-South仪器的光学设计，它克服了这些挑战，并为整个FOV提供了近乎有限的PSF。主要挑战包括校正大角度分裂的沃拉斯顿棱镜（用作分析仪）引入的色散以及整个视场的其他像差，以在检测器上获得成像质量点扩散函数（PSF）。我们介绍了WALOP-South仪器的光学设计，它克服了这些挑战，并为整个FOV提供了近乎有限的PSF。