Molecular clouds are a crucial stage in the lifecycle of a star, and the far ultraviolet (FUV) spectral range is a prime observation band. Hyperion is an FUV space telescope that investigates the birth clouds of stars using a high-resolution spectrometer. To meet the scientific requirements, we developed and evaluated a spectrometer that covers the 140.5 to 164.5 nm wavelength range with a spectral resolution higher than 30,000. We employed on-axis and on-plane dispersive optic layouts to control the aberration from a large aspect ratio slit (10 arcmin × 2.5 arcsec, aspect ratio R = 240). The cross-dispersion isolates three orders from the échelle grating (n = − 19, −18, and −17), and the subsequent two-mirror freeform imaging optics form a two-dimensional spectral distribution on a 50 mm × 50 mm detector array. The geometrical and spectral performances of this innovative design are evaluated.

中文翻译：

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Hyperion UV空间望远镜的长缝交叉色散光谱

分子云是恒星生命周期中的关键阶段，而远紫外（FUV）光谱范围是主要的观察带。Hyperion是FUV太空望远镜，它使用高分辨率光谱仪研究恒星的诞生云。为了满足科学要求，我们开发并评估了一种光谱仪，该光谱仪覆盖140.5至164.5 nm的波长范围，光谱分辨率高于30,000。我们采用了轴上和平面上的色散光学布局，以控制大长宽比狭缝（10 arcmin×2.5 arcsec，长宽比R = 240）的像差。交叉色散从埃歇尔光栅中分离出三个阶（n = − 19，−18和-17），随后的两镜自由形式成像光学器件在50 mm×50 mm探测器阵列上形成二维光谱分布。