应用全息变间距光栅的极紫外成像光谱仪光学系统设计  

Design of Optical System for Solar Extreme-Ultraviolet Imaging Spectrometer Using Holographic Varied Line Spacing Grating

作　　者：刘壮[1,2] 巩岩[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室,吉林长春130033 [2]中国科学院研究生院,北京100049

出　　处：《中国激光》2012年第11期229-234,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(40974110)资助课题

摘　　要：随着对太阳等离子体活动物理过程研究的深入,对太阳极紫外成像光谱仪的性能要求越来越高,而设计高性能太阳极紫外成像光谱仪的一个重要方法就是应用变间距光栅。提出了一种应用全息变间距光栅的太阳极紫外成像光谱仪的设计方法:首先设计系统的初始光学结构,然后根据全息变间距光栅光程差原理,利用1stopt软件的通用全局优化算法计算出像差小的光栅,最后用Zemax软件对整个系统进行建模与优化。给出了设计实例,设计出的太阳极紫外成像光谱仪工作波长范围为17～21nm,视场为2400″,空间分辨率为0.6″,光谱分辨率为0.00225nm/pixel,长度约为2m。在光谱范围内,空间方向与光谱方向的均方根半径以及截止频率范围内的调制传递函数均满足要求。With the in-depth research in the physical process of solar activities, the demand for the performance of solar extreme-ultraviolet imaging spectrometer is increasing. One important method of designing high-performance sun extreme-ultraviolet imaging spectrometer is to use the holographic varied line spacing grating. The design method is presented in this paper as follows. The initial optical structure of the system is designed firstly. Then the grating whose aberration is small is calculated based on holographic varied line spacing grating＇ s optical path difference theory and universal global optimization of lstopt software. The entire system is modeled and optimized with optical design software Zemax finally. A design example is given with the working band of 17- 21 nm, the field of view of 2400″, the spatial resolution of 0.6″, the spectral resolution of 0. 00225 nm/pixel, and the length of about 2 m. In the spectral range, the root mean square radii in spatial direction and spectral direction and the modulation transfer function in the cutoff frequency range all satisfy the requirement.

关 键 词：光学设计 成像光谱仪 全息变间距光栅 通用全局优化 极紫外 Zemax软件 

分 类 号：O434[机械工程—光学工程]