WALOP-South：用于PASIPHAE调查的四相机单次成像偏振仪。论文I --光学设计
WALOP-South: A Four Camera One Shot Imaging Polarimeter for PASIPHAE Survey. Paper I -- Optical Design
摘要：
WALOP-South仪器将安装在南非的1米SAAO望远镜上，作为PASIPHAE方案的一部分，在光学波段对银河系极地区域进行线性成像偏振调查。设计用于在$35\times35$弧分视场内实现$0.05~\%$的偏振灵敏度，它将能够在$0.5~μm - 0.7~μm$之间的SDSS-r宽带和窄带滤波器中在单次曝光中测量斯托克斯参数I、q和u。对于每次测量，将在四个检测器上创建对应于仪器坐标系中的0度、45度、90度和135度的线性偏振角的四个全场图像，可以使用差分光度法从所述四个检测器中找到斯托克斯参数。在设计光学系统时，主要的挑战包括校正用作分析器的大分裂角Wollaston Prisms引入的色散以及来自整个场的其他像差，以在检测器处获得成像质量PSF。我们提出了WALOP-南仪器的光学设计，它克服了这些挑战，并为整个视场提供了近距离可见的有限PSF。
英文摘要：
The WALOP-South instrument will be mounted on the 1 m SAAO telescope in South Africa as part of the 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 $35\times35$ arcminute field of view, it will be capable of measuring the Stokes parameters I, q and u in a single exposure in the SDSS-r broadband and narrowband filters between $0.5~μm - 0.7~μm$. 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 as well as other aberrations from the entire field to obtain imaging quality 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 field of view.
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