论文标题
几种模式纤维中的模态噪声
Modal noise in few-mode fibers
论文作者
论文摘要
NIRPS（近红外行星搜索者）是AO辅助和纤维馈电光仪，可用于YJH波段中的高精度径向速度测量。 Nirps还具有特异性是SCAO辅助仪器，可以首次使用几种模式纤维。这种选择通过允许设计紧凑的低温光谱仪，同时在不良的看见条件和微弱的恒星下保持高耦合效率，从而提供了出色的权衡。主要缺点位于更重要的模态噪声中，这个问题必须解决1m/s精确的径向速度测量值。 我们在本文中介绍了半经验工作的结果，该工作允许验证拼凑而成的装置和减轻模态噪声的策略。它首先基于最终纤维的完整实验室测量值。其次，在光谱仪设计中注入了此类测量值，特别是研究光栅和光学照明对衍生RV的影响。
NIRPS (Near Infra-Red Planet Searcher) is an AO-assisted and fiber-fed spectrograph for high precision radial velocity measurements in the YJH-bands. NIRPS also has the specificity to be an SCAO assisted instrument, enabling the use of few-mode fibers for the first time. This choice offers an excellent trade-off by allowing to design a compact cryogenic spectrograph, while maintaining a high coupling efficiency under bad seeing conditions and for faint stars. The main drawback resides in a much more important modal-noise, a problem that has to be tackled for allowing 1m/s precision radial velocity measurements. We present in this paper the result of a semi-empirical work that allowed to validate the scrambling device and strategies to mitigate modal noise. It is based at first on a complete set of lab measurements of the final fibers. Second, such measurements are injected in the spectrograph design to study in particular the impact of grating and optics illumination on derived RVs.
