一种长狭缝均匀色散的Dyson棱镜成像光谱仪  

Dyson Prism Imaging Spectrometer with Long Slit and Uniform Dispersion

作　　者：范纪泽 李博[1] 叶新[1] 李寒霜 林冠宇[1] Fan Jize;Li Bo;Ye Xin;Li Hanshuang;Lin Guanyu(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,Jilin,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院大学,北京100049

出　　处：《光学学报》2022年第13期142-149,共8页Acta Optica Sinica

基　　金：黑土地保护与利用科技创新工程专项资助(XDA28050102)。

摘　　要：国内外研究的Dyson棱镜成像光谱仪有自身像差较小、高透过率等优点。对Dyson棱镜式成像光谱仪存在的色散均匀性进行改进,通过分析不同材料棱镜的色散规律,选用了熔融石英及CaF2材料构成的消色差棱镜组,并采用超环反射面及透镜组校正其余像差。优化得到一种长度为80 mm的狭缝、色散较为均匀的Dyson棱镜成像光谱仪,同时采用双反物镜结构及拼接狭缝的手段达到总体200 km的幅宽要求。结果表明,在400~2500 nm波段范围及狭缝长度为80 mm的条件下,光谱分辨率为10 nm,光学系统设计值在25 lp/mm截止频率下,调制传递函数大于0.6。通过各波长色散后的像面光谱位置可以得出,在400~1200 nm范围内,色散曲线与拟合直线之间的拟合精度由单材料棱镜时的0.88提高到两种材料棱镜时的0.94,色散均匀性也得到了极大的改善。The advantages of small aberration and high transmittance exist in Dyson prism imaging spectrometers studied at home and abroad. The purpose of this paper is to improve the dispersion uniformity of the Dyson prism imaging spectrometer. By analyzing the dispersion law of prisms made of different materials, this paper chooses fused silica and CaF2materials to form achromatic prism group, and uses super-ring reflecting surface and lens group to correct other aberrations. Through optimization, a Dyson prism imaging spectrometer with a slit length of 80 mm and uniform dispersion is obtained. At the same time, the structure of double-objective lens and the means of splicing slits are chosen to meet the overall requirement of 200 km swath. The results show that the resolution is 10 nm in 400-2500 nm band and the slit length is 80 mm. The design value of the optical system is under the 25 lp/mm cut-off frequency, and the modulation transfer function is larger than 0. 6. According to the spectral position of the image surface after dispersion of each wavelength, we obtian that in the range of 400-1200 nm, the fitting accuracy between the dispersion curve and the fitting line increases from 0. 88 in the case of a double material prism to 0. 94 in the case of a single material prism, which greatly improves the dispersion uniformity.

关 键 词：光学设计 成像光谱仪 消色差棱镜 Dyson棱镜 

分 类 号：TH744[机械工程—光学工程]