VIPER的光学设计：一种用于表征系外行星大气逃逸的高分辨率多模光纤馈送维纳光阵列摄谱仪
Optical design of VIPER: a high-resolution multimode fiber-fed VIPA spectrograph for characterizing exoplanet atmospheric escape
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中文总结 AI 辅助
介绍用于表征系外行星大气逃逸的VIPER摄谱仪光学设计，基于VIPA，针对多模光纤馈送难题采用新方法，经计算和模拟验证设计，证明其可作为传统光栅摄谱仪替代品用于系外行星等天文应用。
中文摘要 AI 辅助
我们展示了VIPER的光学设计，它是一种基于虚拟成像相控阵列（VIPA）的高分辨率、多模光纤馈送、窄带、交叉色散、受视场限制的摄谱仪，该光谱色散器比传统衍射光栅具有更高的色散和更紧凑的外形。VIPER专为通过氦1083纳米三线系探测系外行星大气逃逸而设计，在10纳米波长范围内分辨率为300,000。它计划在美国亚利桑那州霍普金斯山弗雷德·劳伦斯·惠普尔天文台的1.5米蒂林哈斯特望远镜上运行，并与该望远镜f/6的100微米圆形芯多模光纤馈送相匹配。由于多模光纤馈送的扩展量较大，在维纳光阵列摄谱仪中实现高吞吐量更具挑战性，因此我们的设计采用了圆柱光束扩展器和光瞳切片器的新颖用法。我们使用解析计算和Zemax OpticStudio非序列模式下的模拟来验证设计。结果表明多模光纤馈送维纳光阵列摄谱仪作为传统基于光栅的摄谱仪的紧凑、高吞吐量替代品用于系外行星科学和其他天文应用的可行性。
英文摘要
We present the optical design of VIPER: a high-resolution, multimode fiber-fed, narrowband, cross-dispersed, seeing-limited spectrograph based on a Virtually Imaged Phased Array (VIPA), a spectral disperser that provides higher dispersion and a more compact form factor than conventional diffraction gratings. VIPER is specifically designed to probe exoplanet atmospheric escape through the helium 1083 nm triplet line, with a resolving power of 300,000 over a 10 nm wavelength range. VIPER is intended for operation at the 1.5 m Tillinghast Telescope at the Fred Lawrence Whipple Observatory (FLWO) on Mount Hopkins, Arizona, USA, and is matched to this telescope's 100 $μ$m circular-core multimode optical fiber feed at f/6. VIPER's optical design is specifically optimized for high throughput, which, in a VIPA spectrograph, is more challenging with a multimode fiber feed than a single-mode fiber feed because of the larger etendue. To address this challenge, our design implements a novel use of a cylindrical beam expander and pupil slicer. We validate our design using analytic calculations and simulations in Zemax OpticStudio non-sequential mode. Our results demonstrate the feasibility of multimode fiber-fed VIPA spectrographs as compact, high-throughput alternatives to conventional grating-based spectrographs for exoplanet science and other astronomical applications.
