以宽光谱范围、 高分辨率的中阶梯光栅光谱仪为研制目标, 介绍了中阶梯光栅的色散特性, 阐述了基于它的交叉色散原理, 提出了分辨率优先的中阶梯光栅-棱镜交叉色散光路设计方法, 包括高分辨率的主色散光路设计、 分辨叠级的辅助色散光路设计, 及主-辅色散光路联合校验三个递进的环节, 并结合商用光谱仪进行了实例设计, 仿真和实验表明, 当光谱范围为400~900 nm时, 该分光系统在Hg灯546 nm处的分辨率可达51 000, 在Na光589 nm处的分辨率为44 000。

Aiming at the wide-spectrum high-resolution echelle spectrometer, the dispersion characteristic of the echelle grating and the cross-dispersion principle is discussed. And an optical design method of resolution preferential echelle-prism cross-dispersion is described, including the design of high-resolution main dispersion, the auxiliary dispersion for the separation on the overlapped orders, and the main-auxiliary dispersion calibration and revision. According to the requirements of commercial spectrometer, a design example is reported. The simulation and the experiment results show that when the spectral span is 400～900 nm, the resolution for Hg 546 nm is 51 000, and that for Na 589 nm is 44 000.