利用衍射光学元件消色差和对波面进行任意整形及自由曲面光学元件校正像差的特性, 将衍射光学元件和自由曲面光学元件应用于传统可见光光谱成像光谱仪成像系统中, 提出了一种新型的可见光光谱成像光谱仪成像系统, 基于衍射光学元件独特的负色散特性, 用一片折射/衍射混合光学元件代替传统的双胶合透镜来实现消色差, 基于自由曲面光学元件的多自由度特性, 在系统中引入两个自由曲面光学元件对系统中的像差进行有针对性的校正, 针对具体的设计实例给出了详细的设计步骤, 设计结果表明, 在相同的参数指标前提下, 新型系统仅为4片式结构, 和传统系统相比, 重量减轻22.9%, 总长缩短26.6%, 最大口径减小30.6%, 调制传递函数值最大提升为1.0视场, 调制传递函数值提高0. 35, 最大畸变减小1.6%, 最大垂轴像差减小56.4%, 轴向色差减小59.3%, 新型系统各方面的性能都得到了较大的改进, 为现代高性能、轻小型可见光光谱成像光谱仪成像系统设计提供了一种新的途径。

A novel visible spectrum imaging spectrograph optical system was proposed based on the negative dispersion, the arbitrary phase modulation characteristics of diffractive optical element and the aberration correction characteristics of freeform optical element. The double agglutination lens was substituted by a hybrid refractive/ diffractive lens based on the negative dispersion of diffractive optical element. Two freeform optical elements were used in order to correct some aberration based on the aberration correction characteristics of freeform optical element. An example and frondose design process were presented. When the design parameters were uniform, compared with the traditional system, the novel visible spectrum imaging spectrograph optical system's weight was reduced by 22.9％, the total length was reduced by 26.6%, the maximal diameter was reduced by 30.6%, and the modulation transfer function (MTF) in 1.0 field-of-view was improved by 0.35 with field-of view improved maximally. The maximal distortion was reduced by 1.6%, the maximal longitudinal aberration was reduced by 56.4%, and the lateral color aberration was reduced by 59.3%. From these data, we know that the performance of the novel system was advanced quickly and it could be used to put forward a new idea for modern visible spectrum imaging spectrograph optical system design.