标题： 针对4MOST和Hector的高效且经济的折反射光谱仪设计 显示英文标题

标题： Efficient and affordable catadioptric spectrograph designs for 4MOST and Hector

摘要： 光谱仪的成本已成为多路复用光纤光谱仪器的限制因素，因为现在需要数千万个分辨率单元（光谱 × 空间）。折反射（类似施密特）设计允许使用更快的相机，从而降低探测器成本，而最近非球面透镜生产技术的进步使整体光学元件成本与透射式设计具有竞争力。经典的施密特设计由于探测器位于光束内而遭受遮挡损失。一种新的折反射设计将探测器放置在靠近光谱仪孔径的位置，因此大部分位于望远镜顶端遮挡的阴影区域。其传输效率与最佳透射式设计相当，在蓝色波段（通常最有价值的地方）则更好。该设计还具有较轻度的非球面和更紧凑的结构，并避免了经典施密特设计的大多数操作难题。 显示英文摘要

摘要： Spectrograph costs have become the limiting factor in multiplexed fiber-based spectroscopic instruments, because tens of millions of resolution elements (spectral x spatial) are now required. Catadioptric (Schmidt-like) designs allow faster cameras and hence reduced detector costs, and recent advances in aspheric lens production make the overall optics costs competitive with transmissive designs. Classic Schmidt designs suffer from obstruction losses caused by the detector being within the beam. A new catadioptric design puts the detector close to the spectrograph pupil, and hence largely in the shadow of the telescope top-end obstruction. The throughput is competitive with the best transmissive designs, and much better in the Blue, where it is usually most valuable. The design also has milder aspheres and is more compact than classic Schmidts, and avoids most of their operational difficulties.