摘要
基于平场全息凹面光栅几何像差理论,分析了初级像差与高阶像差特别是球差对平场全息凹面光栅成像的作用。通过一个具体的设计,分别讨论宽波段光栅和窄波段光栅设计中校正球差与否对设计结果的影响。通过对光谱像大小和各种像差系数大小进行对比分析得出以下结论:宽波段平场全息凹面光栅像差较大,决定光谱像大小的主要是初级像差,球差的影响难以显现,在进行光栅设计时可以不考虑球差;窄波段光栅的离焦像差较小,球差的影响开始变得显著,此时在设计过程中考虑球差的校正能够进一步改善光栅的成像质量。
The effect of primary aberration and high-order aberration, especially spherical aberration, on imaging of flat-field holographic concave gratings is analyzed by using geometrical aberration theory. The difference between design results when spherical aberration is corrected or not is discussed through a specific design case, for situation of wide wave-range and narrow wave-range, respectively. Analysis is made through comparison of the spectral image size and the geometrical aberration coefficients. It is discovered that, for wide wave-range grating, the image size is determined mainly by primary aberration. Spherical aberration can be ignored during grating design procedure because the effect of spherical aberration is much less than that of primary aberration. But in the case of narrow wave-range grating, the effect of spherical aberration becomes significant because the defocus aberration is very small. The spherical aberration must be corrected in the design procedure when a much better imaging quality is expected.
出处
《激光与光电子学进展》
CSCD
北大核心
2013年第1期93-98,共6页
Laser & Optoelectronics Progress
基金
国家自然科学基金(60478034)
国家重大科学仪器设备开发专项(2011YQ120023)
国家创新方法工作专项(2008IM040700)
中国科学院知识创新项目(100132H100)
江苏省自然科学基金(BK2012188)资助课题
关键词
光栅
光谱仪
平场
全息凹面光栅
几何像差
点列图
gratings
spectrometer
flat field
holographic concave grating
geometrical aberration
spot diagram
