基于同心离轴双反射系统成像光谱仪的像散校正(英文)  

Astigmatism Compensation in Imaging Spectrometer Based on Concentric Off-axis Dual Reflector System

作　　者：陈廷爱[1] 唐义[1] 张丽君[1] 常月娥[1] 郑成[1] 

机构地区：[1]北京理工大学光电学院光电成像技术与系统教育部重点实验室,北京100081

出　　处：《光子学报》2014年第6期98-105,共8页Acta Photonica Sinica

基　　金：The National Key Basic R&D Program of China(No.2013CB329202);the Basic Industrial Technology Project(No.J312012B002)

摘　　要：提出了一种基于同心离轴双反射系统的成像光谱仪，该系统由四片球面反射镜与一块平面光栅组成．在分析同心离轴双反射系统的基础上，结合像差理论与光程函数概念，推导了同心离轴双反射系统的像散公式，得到其消像散条件．消像散理论表明，将消像散的同心离轴双反射系统分别应用于成像光谱仪的准直光路与聚焦光路中，可以实现成像光谱仪全光路消像散．研究了准直光路与聚焦光路共心对称的成像光谱仪结构，给出了其通用设计算法．根据初始结构计算方法，设计了工作波段在远紫外（120～180nm）的成像光谱仪实例，给出了初始结构的点略图与像散曲线图，以验证消像散理论的正确性．结果表明，初始结构完全符合消像散理论．优化设计后的成像光谱仪光谱分辨率接近1．6nm，调制传递函数值全视场全波段在0．37以上，具有良好的成像质量．A specific imaging spectrometer based on concentric off-axis dual reflector system was proposed which consisted of four spherical mirrors and a plane grating. On the basis of analysis of the concentric off-axis dual reflector system, aberration theory and optical path-length concept were used to derive an expression for the separation of astigmatic images in concentric off-axis dual reflector system, the astigmatism elimination in which was found further. It is shown that the astigmatism of the imaging spectrometer can be eliminated by applying concentric off-axis dual reflector system without astigmatism in both the collimating and condensing optics. A symmetrical and concentric imaging spectrometer was described and a generalized design procedure was shown. The symmetrical and concentric imaging spectrometer working in far-ultraviolet （120 ~ 180 nm） wavelength was simulated by applying the design procedure. To verify the stigmatic principle, spot diagram and the curves of astigmatism were shown. The results show that the initial structure satisfies the stigmatic principle well. The spectral resolution of the optimized spectrometer is close to 1.6 nm and the modulation transfer function is more than 0. 37 for the total field of view at all wavelengths, which provides good imaging quality.

关 键 词：成像光谱仪 像散 光程 同心离轴双反射系统 光学设计 

分 类 号：O433.1[机械工程—光学工程] TH744.1[理学—光学]