Design of astigmatism-free crossed Czerny-Turner spectrometer
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摘要:以相对孔径为1:8,工作波段为780~1 014 nm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。
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关键词:
- 光学设计/
- 切尔尼-特纳(C-T)结构/
- 交叉型光谱仪/
- 消像散结构/
- 消彗差结构
Abstract: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 structures for the two types of crossed C-T optical systems are then optimized, and the performance merits are compared. It is shown that the astigmatism-free crossed C-T structure has superior optical performance with an RMS for the spot diagram only 12% 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. -
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