高分辨率阶梯光栅光谱仪的光学设计

Optical design of high resolution echelle spectrograph

简述阶梯光栅的基本原理和在天文学中的应用,分析并比较了阶梯光栅光谱仪与普通平面闪耀光栅光谱仪的区别。为正在研制中的一架国产4m通光口径的光谱巡天望远镜(简称LAMOST)设计了高分辨率阶梯光栅光谱仪的光学方案,该设计方案采用了白光孔径准直镜系统,大闪耀角的R4阶梯光栅和无遮拦的离轴折叠Schmidt照相机。

The general theories behind echelle and its applications in astronomy are briefed, and the differences between echelle spectrograph and plane grating spectrograph are analyzed and compared. An optical design, which features the use of white pupil collimator system, R4 echelle with large blaze angle, and the fold and off-axial Schmidt camera without center obstruction, has been made for a high resolution echelle spectrograph (Large Sky Area Multi-Object Fiber Spectroscopic Telescope) under development, a more powerful tool for astrophysical research using high-resolution spectroscopy in China.