FiberPol的调试与在轨性能：用于南非天文台1.9米望远镜的光纤馈送光谱偏振系统
Commissioning and on-sky performance of FiberPol: a fiber-fed spectropolarimetric system for the SAAO 1.9 m telescope
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中文总结 AI 辅助
南非天文台开发的FiberPol光谱偏振前端，结合光纤光谱学与偏振测量技术。经调试已展示关键性能，斯托克斯参数等不确定度在0.2%至0.3%，升级后有望达0.1%精度。其紧凑设计便于适配，介绍了相关成果及升级计划。
中文摘要 AI 辅助
在南非天文台（SAAO），我们开发了FiberPol——一种用于1.9米望远镜上由光纤馈送的SpUpNIC光谱仪的光谱偏振前端。它与SpUpNIC结合，将光纤光谱学和偏振测量这两种特殊技术相结合，适用于广泛的科学研究，特别是星际介质研究，还为如10米南非大望远镜等大型设施实施偏振测量提供技术探索。2025年初调试的FiberPol已展示关键性能基准。基于初步数据处理流程，在400至700纳米波长范围内的5纳米光谱波段中，测得的斯托克斯参数q和u以及偏振度p的不确定度在0.2%至0.3%之间。经改进校准和精细分析，有望达到每波段0.1%精度的设计目标。成功调试后已有多个科学项目开展。FiberPol采用沃拉斯顿棱镜和半波片系统分析线偏振并提取包含波长（λ）和斯托克斯参数（I、q和u）的光谱偏振数据。其紧凑模块化设计主要使用小型商用光学和光机械部件，便于适应其他光谱仪，包括大型望远镜上的光谱仪。本文介绍了FiberPol的设计、实验室验证和调试结果，并概述了计划中的升级以进一步增强其科学影响力。
英文摘要
At the South African Astronomical Observatory (SAAO), we have developed FiberPol$-$ a spectropolarimetric front-end for the SpUpNIC spectrograph on the 1.9 m telescope fed by fibers. In conjunction with SpUpNIC, it combines two niche techniques: fiber-spectroscopy and polarimetry to enable a wide range of science cases, particularly for studies of the interstellar medium, and serves as a technology pathfinder for implementing polarimetry larger facilities such as the 10 m Southern African Large Telescope. Commissioned in early 2025, FiberPol has already demonstrated key performance benchmarks. Based on a preliminary data reduction pipeline, we find that the uncertainties in the measured Stokes parameters $q$ and $u$, and the degree of polarization $p$ are in the range of 0.2% to 0.3% in 5 nm spectral bins across the 400 to 700 nm wavelength range. With improved calibration and refined analysis, we expect to reach our design goal of 0.1% accuracy per bin. Several science programs are already underway following its successful commissioning. FiberPol employs a Wollaston prism and half wave plate system to analyze linear polarization and extract spectropolarimetric data comprising wavelength ($λ$) and the Stokes parameters ($I$, $q$ and $u$). Its compact and modular design uses primarily small, commercially available optical and optomechanical components, making it straightforward to adapt to other spectrographs, including those on larger telescopes. This paper presents the design, laboratory validation, and commissioning results of FiberPol, and outlines planned upgrades to further enhance its scientific impact.
