交叉型消像散Czerny-Turner结构光谱仪设计

以相对孔径为1：8，工作波段为780～1014nm为初始光学参数，首次推导出交叉型Czerny-Turner（C-T）结构光谱仪的一阶消像散条件，搭建了交叉型消像散C-T结构和交叉型消彗差C-T结构。利用ZEMAX软件对两种初始结构进行了优化和比较。结果表明：交叉型消像散C-T结构具有更优越的光学性能，其均方根半径仅是消彗差C-T结构的12％～52％。消像散C-T结构不仅在沿狭缝方向上能量更为集中，利于设计大聚光能力的分光系统，而且在沿垂直于狭缝方向上点斑更小，具有更高的光谱分辨率。

Design of astigmatism-free crossed Czerny-Turner spectrometer

The first-order astigmatism-free conditions in a crossed Czerny-Turner（C-T） structure spectrometer are derived in this paper and the optical parameters determined for a relative aperture of 1：8 and a working range of 780 nm to 1 014 nm. An astigmatism-free crossed C-T spectrometer is built up with ZEMAX software, and a corresponding coma-free crossed C-T spectrometer is also built up for the comparison. The initial struc- tures for the two types of crossed C-T optical systems are then optimized, and the performance merits are com- pared. It is shown that the astigmatism-free crossed C-T structure has superior optical performance with an RMS for the spot diagram only12% to 52% , compared with that of the corresponding coma-free C-T structure over the working range. This indicates that the astigmatism-free crossed C-T structure possesses not only a better energy concentration along the slit direction, which is beneficial to spectrometers requiring larger condenser capacity, but also a smaller spot diameter along the direction perpendicular to the slit indicating that a higher spectrum resolution is achievable.