光学学报, 2017, 37 (11): 1122001, 网络出版: 2018-09-07   

基于双Amici棱镜设计的多狭缝偏振成像光谱仪 下载: 929次

Multi-Slit Polarization Imaging Spectrometer Based on Double Amici Prism
作者单位
1 西安电子科技大学物理与光电工程学院, 陕西 西安 710071
2 中国科学院光电研究院计算光学成像技术重点实验室, 北京 100094
摘要
偏振成像光谱技术可以获取目标景物的七维空间信息,其获取丰富数据信息的能力使它的应用越来越广泛。基于双Amici棱镜对多狭缝偏振成像光谱仪的光学系统进行设计,采用双Amici棱镜作为系统的分光元件提供宽视场平行光束色散,以满足多狭缝的需求;宽视场的多狭缝结构是基于常规狭缝式成像光谱仪结构进行优化的。本系统中宽视场的多狭缝光谱仪结构须做好与前置望远物镜的光瞳衔接。成像系统和偏振光谱仪系统均采用远心结构,以便与光瞳匹配,系统总长度为279 mm,系统光路共轴,结构紧凑;通过调制传递函数(MTF)和点列图对光学系统的像质进行评价。结果表明:全系统在各视场典型波长处的MTF均接近衍射极限,MTF在39 lp/mm处超过了0.75;各典型波长处的点列图均在艾里斑内,接近完美成像;3条狭缝对应3个不同的偏振态,可通过推扫获取目标景物的偏振信息、空间信息和光谱信息。
Abstract
Seven-dimensional spatial information of a target scene can be obtained with utilization of the polarization imaging spectroscopy. The polarization imaging spectroscopy is applied more and more widely due to its ability of getting rich data information. We design an optical system of multi-slit polarization imaging spectrometer based on the double Amici prism. As a light splitting element, the double Amici prism can provide parallel beam dispersion of wide field to meet the needs of the multi-slit. We optimize the optical structure of the multi-slit based on the conventional slit imaging spectrometer. The pupil of wide field in the multi-slit spectrometer structure must match with the pupil of the front telescope. The imaging system and polarization spectrometer system adopt telecentric structure to match the pupil. The total length of the system is 279 mm. The system has coaxial optical path, and its structure is very compact. We evaluate the image quality of the optical system by using modulation transfer function (MTF) and spot diagrams. The results show that the MTF at typical wavelengths in each typical field is close to the diffraction limit, and the MIF is over 0.75 at 39 lp/mm. The spot diagram at each typical wavelength is in the Airy spot, which means that the imaging is almost perfect. Three slits correspond to three different polarization states. Polarizations information, spatial information, and spectral information of the target scene can be obtained by pushing-brooming.

裴琳琳, 相里斌, 吕群波, 邵晓鹏. 基于双Amici棱镜设计的多狭缝偏振成像光谱仪[J]. 光学学报, 2017, 37(11): 1122001. Linlin Pei, Bin Xiangli, Qunbo Lü, Xiaopeng Shao. Multi-Slit Polarization Imaging Spectrometer Based on Double Amici Prism[J]. Acta Optica Sinica, 2017, 37(11): 1122001.

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